Physics 1025 Midterm

When a cannonball is fired from a cannon, which undergoes the greater acceleration? a) the cannonball b) the recoiling cannon c) both the same

a) the cannonball

A ball rolling down an incline has its maximum potential energy at a) the top b) a quarter of the way down c) halfway down d) the bottom

a) the top

Which will remain the same for two identical books, one lying flat and the other standing on an end? a) weight b) pressure c) both of these d) neither of these

a) weight

The first evidence confirming the crystal structure of matter was a) x-ray diffraction patterns b) the citing of experiments by Nobel Prize-winning scientists c) testimonials by crystal loving investigators

a) x-ray diffraction patterns

Your friend says that the heavyweight champion of the world cannot exert a force of 50 N on an isolated piece of tissue paper with his best punch. You...

agree

Arnold Strongman and Suzie Small each pull very hard on opposite ends of a massless rope in a tug-of-war. The greater force on the rope is exerted by

both the same, interestingly

Two 5000-kg rail cars roll without friction (one at 1 m/s, the other at 2 m/s) toward each other on a level track. They collide, couple, and roll together with a combined momentum of a) 10,000 kg m/s b) 15,000 kg m/s c) zero d) 5000 kg m/s

d) 5000 kg m/s

A 1-kg rock is suspended from the tip of a horizontal meterstick at the 0-cm mark so that the meterstick barely balances like a seesaw when its fulcrum is at the 25-cm-mark. From this information, the mass of the meterstick is a) 1/4 kg b) 1/2 kg c) 3/4 kg d) 1 kg

d) 1 kg

A 2 kg rifle that is suspended by strings fires a 0.01-kg bullet at 200 m/s. The recoil velocity of the rifle is about a) 0.001 m/s b) 0.01 m/s c) 0.1 m/s d) 1 m/s

d) 1 m/s

The buoyant force acting on a 10-ton ship floating in the ocean is a) depends on density of sea water b) less than 10 tons c) more than 10 tons d) 10 tons

d) 10 tons

A hydraulic press has its input piston depressed 20 centimeters while the output piston is raised 1 centimeter. A 1-newton input can lift a load of a) 1 N b) 10 N c) 15 N d) 20 N

d) 20 N

A hydraulic jack is used to lift objects such as automobiles. If the input force is 200 N over a distance of 1 meter, the output force over a distance of 0.1 meter is ideally a) 200 N b) 500 N c) 1000 N d) 2000 N

d) 2000 N

The work done in pushing a TV set a distance of 2 m with an average force of 20 N is a) 2 J b) 10 J c) 20 J d) 40 J e) 800 J

d) 40 J

A metal block has a density of 5000 kg per cubic meter and a mass of 15,000 kg. What is its volume? A) 0.33 cubic meters B) 3 cubic meters C) 5 cubic meters D) 15 cubic meters E) none of the above

B) 3 cubic meters

Which has more skin compared to its body weight? A) an elephant B) a mouse C) both the same

B) a mouse

Buoyant force is greater on a submerged 10-newton block of A) lead. B) aluminum. C) same on each

B) aluminum.

When an object is partly or wholly immersed in a liquid, it is buoyed up A) by a force equal to its own weight. B) by a force equal to the weight of liquid displaced. C) and floats in accord with Archimedes' principle. D) all of the above E) none of the above

B) by a force equal to the weight of liquid displaced.

f you hold two objects that have the same weight density, then they A) may have unequal mass densities. B) have equal mass densities. C) are equal in weight.

B) have equal mass densities

Which of these vary for satellites in elliptical orbits? A) speed. B) momentum. C) kinetic energy. D) all of the above E) none of the above

D) all of the above

How far must one travel to escape Earth's gravitational field? A) to a region above Earth's atmosphere B) to a region well beyond the Moon C) to a region beyond the solar system D) forget it; you can't travel far enough.

D) forget it; you can't travel far enough.

A river 100 m wide flows due S. @ 1m/s. A boat that travels 1m/s relative to the water is pointed due east as it crosses from the west bank. The boat reaches the East bank

100 m. farther south

A golf ball moving forward with 1 unit of momentum strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with a momentum of a) 1 unit b) more than 1 unit

b) more than one unit

Whether a truck comes to a stop by crashing into a haystack or a brick wall, the impulse is a) greater with the haystack b) greater with the brick wall c) both the same

c) both the same

The amount of force to sustain motion of a rock in outer space is

zero

Which has the greater momentum when moving? a) a container ship b) a bullet c) either of these depending on speed

c) either of these depending on speed

You stand on your skateboard and exert a 50 N push on the wall next to you. If your mass is 60 kg you'll momentarily accelerate from the wall at about

0.8 m/s^2

Which pulls on the oceans of Earth with a greater force? a) Sun b) Moon c) both pull the same

a) Sun

The time it takes a projectile fired straight up at 10 m/s to reach the top of its path is about

1 second

A block pulled to the left with 15 N and to the right with 5 N at the same time experiences a net force of

10 N to the left

When a karate chop breaks with a 3000-N blow, the amount of force that acts on the hand is

3000 N

Burl and Paul, total weight 1300 N. Tension in supporting ropes 1700 N. Weight of scaffold is

400 N

A vertical vector of 3 units combined with a horizontal vector of 4 units has a resultant of

5 units

1 kg ball at 4 m/s hits a wall, bounces back at 2 m/s. What is the momentum?

6 kg m/s

A car's speed 3 seconds after accelerating from rest at 2m/s^2 is

6 m/s

When a chocolate bar is cut in half, its density is A) halved. B) unchanged. C) doubled.

B) unchanged

According to Kepler, the orbital period of a planet is directly proportional to the A) planet's average distance from the Sun. B) square of the planet's average distance from the Sun. C) cube of the planet's average distance from the Sun.

C) cube of the planet's average distance from the Sun.

When an ice cube in a glass of water melts, the water level A) rises. B) falls. C) remains the same.

C) remains the same.

If an elephant grows proportionally to twice its height, its weight would be multiplied by about A) 2. B) 4. C) 6. D) 8. E) none of the above

D) 8.

The circular path of a satellite orbiting Earth is characterized by a constant A) speed. B) acceleration. C) radial distance. D) all of the above E) none of the above

E) none of the above

Which of these vary for satellites in circular orbits? A) speed. B) momentum. C) kinetic energy. D) all of the above E) none of the above

E) none of the above

The lift experienced by a helicopter involves an action-reaction pair of forces between the

Helicopter blades and the air

As a ball falls, the action force is the Earth's pull on the ball. The reaction force is the

ball's pull on Earth

As a ball falls, the action force is the Earth's pull on the ball. The reaction force is the

ball's pull on the Earth

Bounce

greater change in momentum

Earth's primary energy source is

the Sun

A spring is stretched 10 cm by a suspended 1-kg block. If two such springs side-by-side are used to suspend the 1-kg block, each spring will then stretch A) 5 cm. B) 10 cm. C) 20 cm. D) 30 cm. E) none of the above

A) 5 cm

Earth satellites are typically more than 100 km high so as to be above Earth's A) atmosphere. B) gravitational field. C) both of these

A) atmosphere.

The kinetic energy of a planet is maximum when it is A) closest to the Sun. B) farthest from the Sun. C) least accelerating. D) none of the above

A) closest to the Sun.

A heavy iron ball is placed in an aluminum pie pan that floats in a bucket. The water level at the side of the bucket is marked. Then the ball is removed and allowed to sink in the bucket. The water line at the side of the bucket A) goes down. B) is the same. C) rises.

A) goes down.

Dr. Chuck projects a ball horizontally from a lab bench. The ball lands on a bullseye marked on the floor a horizontal distance equal to the ball's initial speed A) multiplied by its time in the air. B) coupled with its speed of fall. C) squared plus its downward speed squared when hitting the floor. D) all of the above E) none of the above

A) multiplied by its time in the air.

Planets wobble in their orbits due to A) the gravitational attraction to other planets. B) uncertainties in the inverse-square law. C) elliptical-orbit quirks. D) all of the above E) none of the above

A) the gravitational attraction to other planets.

A hunter on level ground fires a bullet at an angle of 10 degrees above the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first? A) the one dropped B) the one fired C) both hit at the same time.

A) the one dropped

The speeds of the planets about the Sun depend on A) their distances from the Sun. B) the masses of the planets. C) their periods of rotation. D) none of the above

A) their distances from the Sun.

If you float a piece of wood in a container brim-full of water that rests on a weighing scale, some water will spill. Then the weight reading on the scale will A) decrease. B) remain unchanged. C) increase.

B) remain unchanged.

What is the weight of water displaced by a 100-ton floating ship?

100 tons

A scale from which a rock is suspended reads 5 N when the rock is out of water and 3 N when the rock is submerged. Buoyant force on the rock is

2N

There is a legend of a Dutch boy who bravely held back the Atlantic Ocean by plugging a leak near the top of a dike with his finger until help arrived. Which is the more likely scenario? A) the huge size of the Atlantic Ocean makes this impossible B) although the force on his finger would have been huge, the pressure would have been small enough for this to occur C) the force on his finger would have been less than 1 N D) both force and pressure on his finger would have been great, but not too great for a public-spirited Dutch lad E) none of the above

C) the force on his finger would have been less than 1 N

Which of the following has the largest momentum relative to Earth's surface? a) a Mack truck parked in a parking lot b) a pickup truck speeding along a highway c) a tightrope walker crossing Niagara Falls d) the Science building on campus e) a mouse running across your room

b) a pickup truck speeding along a highway

A hydraulic press, like an inclined plane, is capable of increasing energy a) sometimes true b) always false c) always true d) sometimes false

b) always false

A bullet fired horizontally from a rifle begins to fall a) after air friction reduces its speed b) as soon as it leaves the barrel c) neither of these

b) as soon as it leaves the barrel

A vertically-held sledge hammer is easier to balance when the heavier end is a) on your hand b) at the top, away from your hand c) the same either way

b) at the top, away from your hand

If the volume of an object were doubled while its mass remained the same, its density would a) be four times as great b) be half c) double d) stay the same

b) be half

Earth's gravitational field extends a) only above and beyond Earth's surface and cancels inside the Earth b) both inside and outside Earth and throughout the entire universe c) neither of these

b) both inside and outside Earth and throughout the entire universe

A karate chop is more effective if one's hand a) follows through upon impact b) bounces upon impact c) extends the time upon impact

b) bounces upon impact

When you rub your hands together, you a) can push harder on one hand than the other b) cannot push harder on one hand than the other

b) cannot push harder on one hand than the other

The force due to gravity that acts on a block of ice that slides down an icy ramp a) is equal to mg at all angles b) decreases as the slope of the ramp increases c) becomes greatest when the ramp is vertical

b) decreases as the slope of the ramp increases

According to Newton, the greater the masses of interacting objects, the a) less the gravitational force between them b) greater the gravitational force between them c) greater the force between them by the square of the masses

b) greater the gravitational force between them

If the Moon were four times as massive but twice as far from Earth, high tides on Earth would be a) higher b) lower c) no different

b) lower

The force of Earth's gravity on a capsule in space increases as it comes closer. When the capsule moves to half its distance, the force toward Earth is then a) twice b) three times greater c) four times greater

c) four times greater

Lobsters live on the bottom of the ocean, which means their density is a) equal to the density of sea water b) less than the density of sea water c) greater than the density of sea water

c) greater than the density of sea water

If a ping-pong ball and a golf ball both move in the same direction with the same amount of kinetic energy, the speed of the ping-pong ball must be a) both the same b) less than the golf ball c) more than the golf ball

c) more than the golf ball

An Earth satellite in an elliptical orbit travels fastest when it is a) farthest from Earth b) everywhere along its orbit c) nearest Earth

c) nearest Earth

A hollow spherical planet is inhabited by people who live inside it, where the gravitational field is zero. When a very massive spaceship lands on the planet's surface, inhabitants find that the gravitational field inside the planet is a) non-zero, directed away from the spaceship b) still zero c) non-zero, directed toward the spaceship

c) non-zero, directed toward the spaceship

When a drawn bow of potential energy 40 J is fired, the arrow will ideally have a kinetic energy a) less than 40 J b) more than 40 J c) of 40 J

c) of 40 J

For lunar tides to occur in the human body a) Earth's gravitation would have to be incredibly small b) most of the body would have to be in the liquid state c) parts of the body would have to be appreciably closer to the Moon than other parts d) none of the above

c) parts of the body would have to be appreciably closer to the Moon than other parts

As you crawl toward the edge of a large freely-rotating horizontal turntable in a carnival funhouse, the angular momentum of you and the turntable a) decreases b) increases c) remains the same, but the revolutions per minute decrease

c) remains the same, but the revolutions per minute decrease

The chef at the the infamous Fattening Tower of Pizza tosses a spinning disk of uncooked pizza dough into the air. The disk becomes wider during its flight, while its rotational speed a) remains constant b) quickens c) slows

c) slows

When holes are drilled through the wall of a water tower, water will spurt out with the greatest speed from the hole closest to a) the top of the tower b) the middle of the tower c) the bottom of the tower

c) the bottom of the tower

Earth pulls on the Moon, and the Moon pulls on Earth, which tells us that a) more massive objects pull harder b) both Earth and Moon circle a common point c) these two pulls comprise an action-reaction pair d) all of the above

c) these two pulls comprise an action-reaction pair

If you do work on a skateboard loaded with friends in one-third the usual time, you expend a) one third as much power b) the usual power c) three times the usual power d) need more info

c) three times the usual power

To catch a fast-moving ball, you extend your hand forward before contact with the ball and let it ride backward in the direction of the ball's motion. Doing this reduces the force of contact on your hand principally because the a) force of contact is reduced b) relative velocity is less c) time of contact is increased d) time of contact is decreased e) none of the above

c) time of contact is increased

Strictly speaking (in physics terms), more fuel is consumed by your car if the air conditioner, headlights, or even a radio is turned on. This statement is a) false b) true only if the car's engine is running c) true

c) true

You wish to drill a hole through a horizontal I-beam supporting a bridge. To weaken the beam the least drill the hole through the A) upper flange. B) lower flange. C) web. D) all the same

c) web

A motorcycle of mass 100 kg slowly rolls off the edge of a cliff and falls for three seconds before reaching the bottom of a gully. Its momentum upon hitting the ground is a) 1,000 kg m/s b) 2,000 kg m/s c) 3,000 kg m/s d) 4,000 kg m/s e) 9,000 kg m/s

c)3,000 kg m/s

If Earth's radius somehow increased with no change in mass, your weight would

decrease

A car traveling at 100 km/h strikes an unfortunate bug and splatters it. The force of impact is

the same for both

An automobile and a golf cart traveling at the same speed collide head-on. The impact force is

the same for both

Harry pulls on the end of a spring attached to a wall. The reaction to Harry's pull on the spring is

the spring pulling on Harry

Nellie pulls with a force of 50 N on a horizontal rope tied to a tree at rest. The net force on the rope is

zero and the rope tension is 50 N

The unit kilowatt-hour is a unit of a) energy b) momentum c) power d) time

a) energy

An asteroid exerts a 360-N gravitational force on a nearby spacecraft. The 360-N force on the spacecraft is directed a) toward the asteroid b) away from the asteroid c) toward the Sun

a) toward the asteroid

If you place a pipe over the end of a wrench when trying to rotate a stubborn bolt, effectively making the wrench handle twice as long, you'll multiply the torque by a) two b) four c) eight

a) two

Two billiard balls having the same mass and speed roll toward each other. What is their combined momentum after they meet? a) zero b) half the sum of their original momentums c) twice the sum of their original momentums d) need more info

a) zero

Terminal speed is when

air resistance = weight and net force is zero.

A machine puts out 100 watts of power for every 1000 watts put into it. The efficiency of the machine is a) 10 % b) 50 % c) 90 % d) 100 %

a) 10 %

A player hits a ball with a bat. If action is the force of the bat against the ball, reaction is the

force that the ball exerts on the bat

A projectile is launched vertically upward at 50 m/s. If air resistance is negligible, its speed upon returning to its starting point is a) 50 m/s b) more than 50 m/s c) less than 50 m/s

a) 50 m/s

Danny Diver weighs 500 N and steps off a diving board 10 m above the water. Danny hits the water with kinetic energy of a) 5000 J b) 500 J c) more than 5000 J d) 10 J e) 510 J

a) 5000 J

A machine that promises more energy output than input is a) a fantasy b) commonplace c) a long-shot worth investing in

a) a fantasy

On a balanced seesaw, a boy three times a s heavy as his partner sits a) less than 1/3 the distance from the fulcrum b) 1/3 the distance from the fulcrum c) more than 1/3 the distance from the fulcrum

b) 1/3 the distance from the fulcrum

About 40 J is required to push a crate 4 m across a floor. If the push is in the same direction as the motion of the crate, the force on the crate is about a) 160 N b) 10 N c) 40 N

b) 10 N

Neglecting air resistance, Sammy Smarts on a high ladder releases a ball that strikes the ground with 100 J of kinetic energy. If he were to instead throw the ball straight upward, it will soon reach the ground with a kinetic energy of a) less than 100 J b) 100 J c) more than 100 J

b) 100 J

A weight watcher who normally weighs 400 N stands on top of a very tall ladder so she is one Earth radius above the Earth's surface. How much would she weigh there? a) 0 b) 100 N c) 200 N d) 400 N

b) 100 N

Phil applies 100 N to a pulley system and raises a load one-tenth of his downward pull. Ideally, the weight of the load is a) 100 N b) 1000 N c) 10,000 N d) more than 10,000 N

b) 1000 N

A 2-kg box of taffy candy has 40 J of potential energy relative to the ground. Its height above the ground is a) 4 m b) 2 m c) 3 m d) 1 m

b) 2 m

A 1-kg glider and a 2-kg glider both slide toward each other at 1 m/s on an air track. They collide and stick. The combined mass moves at a) 1.5 m/s b) 0 m/s c) 1/2 m/s d) 1/6 m/s e) 1/3 m/s

e) 1/3 m/s

The exhaust product from a hydrogen fuel cell is

pure water

Acceleration and velocity are actually

rates but for different quantities

One end of a rope is pulled with 100 N, while the opposite end also is pulled with 100 N. The tension in the rope is

100 N

When a baseball player bats a ball with a force of 1000 N, the reaction force that the ball exerts against the bat is

1000 N

The resultant of 2 equal vectors of magnitude 100 acting at a right angle to each other is

141.4

A package falls off a truck moving at 30 m/s. Neglecting air resistance the horizontal speed of the package just before it hits the ground is

30 m/s

While an airplane flies at 40 m/s at an altitude of 500 meters, the pilot drops a heavy package that falls to the ground. Neglecting air drag, about where does the package land relative to the plane flying above? A) directly beneath the plane B) 400 m behind the plane C) 500 m behind the plane D) more than 500 m behind the plane E) none of the above

A) directly beneath the plane

An Earth satellite is simply a projectile A) freely falling around Earth. B) floating motionless in space near Earth. C) approaching Earth from outer space.

A) freely falling around Earth.

A block of Styrofoam floats on water while a lead block of the same size block lies submerged in the water. The buoyant force is greatest on the A) lead. B) Styrofoam. C) same for both

A) lead.

Pumice is a volcanic rock that floats, which means its density is A) less than the density of water. B) equal to the density of water. C) more than the density of water. D) need more information.

A) less than the density of water.

If you bake cupcakes as directed for a cake, the cupcakes will be A) over-baked. B) under-baked. C) properly baked.

A) over-baked.

The buoyant force on an object is least when the object is A) partly submerged. B) submerged near the surface. C) submerged near the bottom. D) none of the above

A) partly submerged.

When a load is placed on the middle of a horizontal beam supported at each end, the bottom part of the beam undergoes A) tension. B) compression. C) either of these D) none of these

A) tension

Planets would crash into the Sun if it weren't for A) their tangential velocities. B) their vast distances from the Sun. C) the inverse-square law. D) their relatively small masses. E) the fact that they are beyond the main gravitation of the Sun

A) their tangential velocities.

As soon as a ball rolls off the edge of a table A) it is not acted on by any forces. B) it is not acted on by any horizontal forces. C) has a zero net force acting on it. D) none of the above

B) it is not acted on by any horizontal forces.

When the potential energy of a satellite decreases A) kinetic energy also decreases. B) its kinetic energy correspondingly increases. C) its distance from the orbiting body increases. D) none of the above

B) its kinetic energy correspondingly increases.

Each of us weighs a tiny bit less inside the ground floor of a skyscraper than we do on the ground away from the skyscraper because the A) gravitational field is shielded inside the building. B) mass of the building above slightly attracts us upward. C) both of these D) neither of these

B) mass of the building above slightly attracts us upward.

An astronaut at Earth's surface has a mass of 50 kg and a weight of 500 N. If she were floating freely inside a space habitat in remote space, she would have A) no weight and less mass. B) no weight and the same mass. C) more weight and no mass. D) none of the above

B) no weight and the same mass.

If each dimension of a steel bridge is scaled up ten times, its strength will be multiplied by about A) ten and its weight by ten also. B) one hundred, and its weight by one thousand. C) one thousand, and its weight by one hundred thousand. D) none of the above

B) one hundred, and its weight by one thousand.

As soon as a bowling ball rolls off the edge of a table its horizontal component of velocity A) decreases. B) remains constant. C) increases.

B) remains constant.

Two life preservers have identical volumes, one filled with Styrofoam and the other filled with sand. When the two life preservers are worn by swimmers, one swimmer floats with part of the preserver above water, and the other swimmer sinks. In this case the buoyant force is greater on the life preserver filled with A) Styrofoam. B) sand. C) same for both

B) sand

If you drop a stone into a hole drilled all the way to the other side of Earth (neglect the molten core), the stone will A) come to an abrupt stop at Earth's center. B) speed up until it gets to Earth's center. C) speed up until it reaches Earth's other side. D) slow down until it reaches Earth's center.

B) speed up until it gets to Earth's center.

When a load is placed on a properly arched structure, compression A) weakens the structure. B) strengthens the structure. C) neither of these

B) strengthens the structure.

Compared to a bar of pure gold, the density of a pure gold ring is A) less. B) the same. C) slightly more. D) much more.

B) the same.

Nellie tosses a ball upward at an angle. Assuming no air resistance, which component of velocity changes with time? A) the horizontal component B) the vertical component C) both of these D) neither of these

B) the vertical component

Escape speed from the Sun is A) about the same as from Earth. B) very much greater than for Earth. C) indefinite.

B) very much greater than for Earth.

A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange will the bullet be 1 second later? A) 50 m B) 98 m C) 100 m D) 490 m E) none of the above

C) 100 m

Escape speed from Earth is A) 8 km/s. B) 9 km/s. C) 11.2 km/s. D) 63 km/s.

C) 11.2 km/s.

An Earth satellite in close orbit circles Earth in about an hour and a half. How long would a satellite located as far away as the Moon take to orbit Earth? A) the same hour and a half B) less than an hour and a half C) about 28 days D) need more information E) none of the above

C) about 28 days

A ball rolls off the edge of a table at the same time another ball drops vertically from the same table. The ball to hit the floor first is the A) rolling ball. B) dropped ball. C) both hit at the same time

C) both hit at the same time

Angular momentum is conserved for a satellite in A) circular orbit. B) elliptical orbit. C) both of these D) neither of these

C) both of these

The pressure in a liquid depends on liquid A) density. B) depth. C) both of these D) neither of these

C) both of these

When air drag affects the motion of projectiles, they don't travel A) as high. B) as far. C) both of these D) neither of these

C) both of these

Which has the greater density? A) a cup-full of fresh water B) a lake-full of fresh water C) both the same D) need more information

C) both the same

The Gateway Arch in St. Louis, Missouri, is a A) parabola. B) hyberbola. C) catenary.

C) catenary.

While a rock thrown upward at 50 degrees to the horizontal rises, neglecting air drag, its vertical component of velocity A) increases. B) remains unchanged. C) decreases.

C) decreases.

While standing, your blood pressure is normally greatest in your A) head. B) heart. C) feet. D) same in each

C) feet.

According to Kepler, the line from the Sun to any planet sweeps out equal areas of space A) with each complete revolution. B) only when the paths are ellipses. C) in equal time intervals.

C) in equal time intervals.

If you float a piece of wood in a container half-full of water that rests on a weighing scale, the weight reading on the scale will A) decrease. B) remain unchanged. C) increase.

C) increase.

Suppose you put a chocolate layer on pieces of candy. Compared with the amount of chocolate used to cover 1 pound of large pieces, if you cover 1 pound of smaller pieces you'll use A) less chocolate. B) the same amount of chocolate. C) more chocolate. D) makes no difference

C) more chocolate

Buoyant force acts upward on a submerged object because A) it acts in a direction to oppose gravity. B) the weight of fluid displaced reacts with an upward force. C) pressure against its bottom is greater than pressure against its top. D) none of the above

C) pressure against its bottom is greater than pressure against its top.

Buoyant force is greater on a submerged 1-cubic centimeter block of A) lead. B) aluminum. C) same on each

C) same on each

Two life preservers have identical volumes, but one is filled with Styrofoam while the other is filled with sand. When the two life preservers are fully submerged, the buoyant force is greater on the one filled with A) Styrofoam. B) sand. C) same on each as long as their volumes are the same

C) same on each as long as their volumes are the same

A black hole is A) an empty region of space with a huge gravitational field. B) at the center if all stars. C) the remains of a giant star that has undergone gravitational collapse.

C) the remains of a giant star that has undergone gravitational collapse.

The pressure at the bottom of a jug filled with water does NOT depend on A) the acceleration due to gravity. B) water density. C) the height of the liquid. D) surface area of the water. E) none of the above

D) surface area of the water.

The factor most directly responsible for making a black hole invisible is its A) size. B) mass. C) color. D) surface escape velocity. E) none of the above

D) surface escape velocity.

The density of a submerged submarine at rest is about the same as the density of A) a crab. B) iron. C) a floating submarine. D) water. E) none of the above

D) water.

While a car travels around circular track at constant speed it's a)velocity is 0 b)acc is 0 c) inertia is 0 d) none of the above

NONE OF THE ABOVE

A Mack truck and a Volkswagen traveling at the same speed have a head-on collision. The vehicle that undergoes the greatest change in velocity will be the

Volkswagen

Two identical objects in outer space, one moving at 2 m/s, the other at 1 m/s have a head-on collision and stick together. Their combined speed after the collision is a) 0.5 m/s b) 0.33 m/s c) 0.67 m/s d) 1.0 m/s e) none of the above

a) 0.5 m/s

A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5-kg bowling ball initially at rest. The bowling ball and putty then move with a momentum of a) 1 kg m/s b) 2 kg m/s c) 5 kg m/s

a) 1 kg m/s

A piece of putty moving with 1 unit of momentum strikes and sticks to a heavy bowling ball that is initially at rest. Both move with a combined momentum of a) 1 unit b) more than 1 unit c) less than 1 unit d) need more info

a) 1 unit

A melon is tossed straight upward with 100 J of kinetic energy. If air resistance is negligible the melon will return to its initial level with a kinetic energy of a) 100 J b) less than 100 J c) more than 100 J

a) 100 J

The speed of a 4-kg ball with a momentum of 12 kg m/s is a) 3 m/s b) 4 m/s c) 12 m/s d) 48 m/s e) none of the above

a) 3 m/s

Two identical particles move toward each other, one twice as fast as the other. Just before they collide, one has a kinetic energy of 25 J and the other 50 J. At this instant their total kinetic energy is a) 75 J b) 50 J c) 25 J

a) 75 J

You can swing your legs to and from more frequently when your legs are a) bent b) straight c) same either way

a) bent

A cannon recoils while firing a cannonball. The speed of the cannon's recoil is relatively small because the a) cannon has much more mass than the cannonball b) force against the cannon is smaller than against the ball c) momentum of the cannon is smaller d) momentum is mainly concentrated in the cannonball

a) cannon has much more mass than the cannonball

When the curve of a vertical structure matches the inverted image of a drooping chain held at both ends, the curve is called a a) catenary b) hyperbola c) parabola

a) catenary

When a load is placed on the middle of a horizontal beam supported at each end, the top part of the beam undergoes a) compression b) tension

a) compression

When a train makes a curve, a tapered wheel rim is able to a) cover different distances per revolution b) maintain a fixed rotational speed c) reduce differences in angular speeds

a) cover different distances per revolution

The strength of a beam is most related to its a) cross section b) length c) both of these

a) cross section

When bullets are fired from an airplane in the forward direction, the momentum of the airplane is a) decreased b) increased c) unchanged

a) decreased

When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard, the speed of the skateboard a) decreases b) increases c) neither decreases nor increases

a) decreases

Nellie tosses a ball upward at an angle. Neglecting air resistance, the vertical component of the initial velocity a) decreases with time to reach the top b) remains constant c) increases with time to reach the top

a) decreases with time to reach to top

Impulse involves the time that a force acts, whereas work involves the a) distance that a force acts b) time and distance that a force acts c) acceleration that a force produces

a) distance that a force acts

Your pet hamster sits on a record player that has constant angular speed. If the hamster moves to a point twice as far from the center, then its linear speed a) doubles b) halves c) remains the same

a) doubles

The force of gravity does work on a satellite when it is in a) elliptical orbit b) circular orbit c) both of these d) neither of these

a) elliptical orbit

A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared with the force that stops the car, the force needed to stop the truck is a) greater b) smaller c) the same

a) greater

The center of a long uniform log is raised to shoulder level while the other end is on the ground. If instead, the end of the long is raised to shoulder level, the work required is a) half b) twice c) the same

a) half

A clerk can lift cylindrical packages 1 meter vertically, or can roll them up a 2-meter-long ramp to the same elevation. With the ramp, the applied force required is about a) half as much b) the same c) twice as much d) four times as much

a) half as much

A pair of air pucks on an air table are set in motion when a compressed spring between them is released. If one puck moves with twice the speed of the other, then its mass is a) half the mass of the other b) the same mass as the other c) twice the mass as the other d) need more info

a) half the mass of the other

When a boat sails from fresh water to salt water, the boat will float a) higher in the water b) at the same water level c) lower in the water

a) higher in the water

The direction of a gravitational field is a) in the same direction as gravitational attraction b) away from the center of gravity of an object c) opposite to the direction of gravitational attraction

a) in the same direction as gravitational attraction

If Earth rotated more slowly about its axis, your weight would a) increase b) decrease c) stay the same d) be zero

a) increase

When a twirling ice skater brings her arms inward, her rotational speed a) increases b) remains the same c) decreases

a) increases

When the distance between two stars decreases to one-third the original distance, the force between them a) increases to nine times as much b) increases to twice as much c) decreases by one-third

a) increases to nine times as much

Padded dashboards in cars are safer in an accident than non-padded ones because passengers hitting the dashboard encounter a) lengthened time of contact b) shorter time of contact c) decreased impulse d) increased momentum

a) lengthened time of contact

When you weigh yourself on a bathroom scale on a slight incline instead of a level surface, your weight reading on the scale will be a) less b) no different c) more

a) less

A weightless astronaut in an orbiting satellite is a) like the satellite, pulled by Earth's gravitation b) beyond the pull of gravity c)

a) like the satellite, pulled by Earth's gravitation

Stand a meterstick on its end and let it rotate to the floor. If you attach a heavy glob of clay to its upper end and repeat, the time to fall will be a) longer b) the same c) shorter

a) longer

A primary difference between momentum and kinetic energy is a) momenta can cancel; kinetic energy cannot b) kinetic energy can cancel; momenta cannot c) either of the above depending on circumstances

a) momenta can cancel; kinetic energy cannot

A same-size iron ball and wooden ball are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater a) momentum b) acceleration c) speed

a) momentum

If the speed of a motor scooter doubles, which of the following also doubles? a) momentum b) kinetic energy c) acceleration d) all of the above

a) momentum

A golf ball is thrown at and bounces backward from a massive bowling ball that is initially at rest. After the collision, compared to the golf ball, the bowling ball has more a) momentum, but less kinetic energy b) kinetic energy, but less momentum c) momentum and more kinetic energy

a) momentum, but less kinetic energy

An object that has kinetic energy must be a) moving b) falling c) at an elevated position d) at rest

a) moving

To produce an acceleration to a system there a) must be a net force on the system b) may or may not be a net force on the system c) must be acceleration outside the system also

a) must be a net force on the system

An industrial flywheel has a greater rotational inertia when most of its mass is a) nearer the rim b) nearer the axis c) uniformly spread out as in a disk

a) nearer the rim

A beam is under stress when it carries a load. The part of a beam where no tension or compression occurs is the a) neutral layer b) upper or lower flange c) neither of these

a) neutral layer

Hydro and wind power are indirect forms of a) solar energy b) fossil fuels deep down c) nuclear energy in Earth's interior

a) solar energy

The rotational inertia of your leg is greater when your leg is a) straight b) bent c) same either way

a) straight

Flatten a spherical meatball into a hamburger and you increase its a) surface area b) volume c) both of these d) none of these

a) surface area

When a skateboarder pushes on a wall a) the wall pushes on the skateboard b) such a push couldn't happen unless the wall pushed on the skateboarder c) an interaction occurs between the skateboarder and the wall d) all of the above

all of the above

The circumference of a bicycle wheel is 2 meters. If it rotates at 1 revolution per second then its linear speed is a) 1 m/s b) 2 m/s c) 3 m/s d) 3.14 m/s e) 6.28 m/s

b) 2 m/s

You can safely stand on the overhanging end of a heavy plank that rests on a table. How much overhang depends on your mass and the mass of the plank. If you can stand on the end of a plank that overhangs the edge of the supporting table 1/5 its total length, how massive is the plank compared to your mass? a) 1/3 b) 2/3

b) 2/3

A strong spring is stretched 10 cm by a suspended block. If the block's weight is doubled, the spring will stretch to a) 40 cm b) 20 cm c) 15 cm d) its elastic limit

b) 20 cm

The average braking force of a 1000-kg car moving at 10 m/s braking to a stop in 5 s is a) 1000 N b) 2000 N c) 3000 N d) 4000 N e) 5000 N

b) 2000 N

The average braking force of a 1000-kg car moving at 10 m/s braking to a stop in 5 s is a) 5000 N b) 2000 N c) 3000 N d) 1000 N

b) 2000 N

An asteroid exerts a 360-N gravitational force on a nearby spacecraft. If the spacecraft moves to a position three times as far from the center of the asteroid, the force will be a) zero b) 40 N c) 120 N d) 360 N

b) 40 N

Acrobat Bart at the circus drops vertically onto the end of a see-saw, with his partner Art equidistant from the fulcrum at the other end. Art is propelled straight upward a distance twice that of Bart's dropping distance. Neglecting inefficiencies we see a) the masses of Art and Bart are equal b) Art has half the mass of Bart

b) Art has half the mass of Bart

Which has greater kinetic energy? a) a car traveling at 30 km/hr b) a car of half the mass traveling at 60 km/hr c) both the same

b) a car of half the mass traveling at 60 km/hr

It is correct to say that impulse is equal to a) momentum b) a corresponding change in momentum c) force multiplied by the distance it acts d) velocity multiplied by time

b) a corresponding change in momentum

Which of the following has the largest momentum relative to Earth's surface? a) a tightrope walker crossing Niagara Falls b) a pickup truck speeding along a highway c) a Mack truck parked in a parking lot d) the science building on campus

b) a pickup truck speeding along a highway

Multiply the equation for linear momentum by radial distance r and you have a) rotational kinetic energy b) angular momentum c) rotational inertia

b) angular momentum

The bob of a simple pendulum has its maximum kinetic energy at the a) top of its swing b) bottom of its swing

b) bottom of its swing

The normal force that acts on a block of ice that slides on a ramp a) is equal to mg at all angles b) decreases as the slope of the ramp increases c) becomes greatest when the ramp is vertical

b) decreases as the slope of the ramp increases

The net force exerted on a car traveling in a circular path at constant speed is a) directed forward, in the direction of trave b) directed toward the center of the curve c) zero because the car is not accelerating

b) directed toward the center of the curve

According to Kepler, the paths of planets about the Sun are a) parabolas b) ellipses c) straight lines d) circles e) none of the above

b) ellipses

Two 2-m/s pool balls roll toward each other and collide. Suppose after bouncing apart each moves at 4 m/s. This collision violates the conservation of a) momentum b) energy c) both momentum and energy

b) energy

Two identical golf carts move at different speeds. The faster cart has twice the speed and therefore has a) twice the kinetic energy b) four times the kinetic energy c) eight times the kinetic energy d) none of the above

b) four times the kinetic energy

A ball is tossed upward. Neglecting air drag, the acceleration along its path is a) g upward, then g downward b) g downward c) g upward d) 0 g

b) g downward

An astronaut floating alone in outer space throws a baseball. If the ball moves away at 20 m/s, the astronaut will a) move in the opposite direction at a higher speed b) move in the opposite direction at a lower speed c) move in the opposite direction at 20 m/s d) none of the above

b) move in the opposite direction at a lower speed

Horses with the greatest linear speed on a merry-go-round are located a) near the center b) near the outside c) anywhere, because they all move at the same speed

b) near the outside

The main reason ocean tides exist is that Moon's pull is stronger a) than the pull of the Sun b) on water closer to it than on water farther away c) on Earth's oceans than on Earth itself

b) on water closer to it than on water farther away

According to Newton, when the distance between two interacting objects doubles, the gravitational force is a) half b) one-quarter c) the same d) twice as much e) four times as much

b) one-quarter

Neglecting air resistance, once a tossed ball leaves your hand a) no further force acts on it b) only the force due to gravity acts on it c) inertia becomes the force acting on it d) your tossing force remains while the ball goes upward

b) only the force due to gravity acts on it

Nellie tosses a ball upward at an angle. Neglecting air resistance, the horizontal component of the initial velocity a) decreases with time b) remains constant c) increases with time

b) remains constant

A torque active on an object tends to produce a) equilibrium b) rotation c) linear motion d) velocity e) a center of gravity

b) rotation

Which requires the most amount of work by the brakes of a car a) slowing down from 70 km/h to a stop b) slowing down from 100 km/h to 70 km/h c) equal amounts for both

b) slowing down from 100 km/h to 70 km/h

Which ball is more elastic? a) a common rubber ball b) a steel ball c) both the same

b) steel ball

The pressure at the bottom of a jug filled with water does NOT depend on a) the acceleration due to gravity b) surface area of the water c) water density d) the height of the liquid

b) surface area of the water

If the Sun collapsed to a black hole, Earth's gravitational attraction to it would be a) less b) the same c) more

b) the same

You can safely stand on the overhanging end of a heavy plank that rests on a table. How much overhang depends on your mass and the plank's mass. If you can stand on the end of a plank that overhangs the edge of the supporting table 1/4 its total length, how massive is the plank compared to your mass? a) 1/2 b) the same c) 1 and 1/2 times d) twice e) 4 times

b) the same

If Alex wishes to rotate his skateboard, then he must apply a a)rotational maneuver b) torque c) pause before bearing down on the board

b) torque

A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is a) zero b) twice c) four times as much d) unchanged

b) twice

Relative to an initial height, an object raised twice as high has a gravitational potential energy a) half as much b) twice as much c) four times as much

b) twice as much

The work you do when pushing a shopping cart twice as far while applying the same force is a) half as much b) twice as much c) four times as much

b) twice as much

A completely submerged object always displaces its own a) weight of fluid b) volume of fluid c) density of fluid d) all of the above e) none of he above

b) volume of fluid

Inside a freely-falling elevator, you would have no a) gravitational force on you b) weight c) both of these

b) weight

To rotate a stubborn screw, it is best to use a screwdriver that has a a) smooth handle b) wide handle c) long handle d) none of the above

b) wide handle

The Earth is closer to the Sun in January than in July, which accounts for the fact that the highest high tides in the Northern Hemisphere occur in a) spring b) winter c) summer d) none of the above

b) winter

Pioneer 10 was able to escape the solar system by a) having a sufficient escape velocity at launch b) nuclear powered sustained thrust c) "bouncing off" Jupiter like a tennis ball bouncing off an approaching tennis racket d) refueling via solar cells

c) "bouncing off" Jupiter like a tennis ball bouncing off an approaching tennis racket

A bullet fired horizontally over level ground hits the ground in 0.5 second. If it had been fired with twice the speed it would have hit the ground in a) more than 0.5 s b) less than 0.5 s c) 0.5 s

c) 0.5 s

A 5-kg shark swimming at 1 m/s swallows an absent-minded 1-kg fish swimming toward it at 4 m/s. The speed of the shark after his meal is a) 1/5 m/s b) 2/3 m/s c) 1/6 m/s d) 1/2 m/s e) 3/2 m/s

c) 1/6 m/s

The mass of a ball moving at 3 m/s with a momentum of 48 kg m/s is a) 4 kg b) 12 kg c) 16 kg d) 144 kg e) none of these

c) 16 kg

An astronaut of mass 70 kg weighs 700 N on Earth's surface. His weight on the surface of Mars, where the acceleration due to gravity is 3.7 m/s2, would be about a) 130 N b) 260 N c) 370 N d) none of the above

c) 260 N

A 5-kg fish swimming at 1 m/s swallows an absent-minded 1-kg fish at rest. The speed of the larger fish after lunch is a) 1/2 m/s b) 2/5 m/s c) 5/6 m/s d) 6/5 m/s e) 1 m/s

c) 5/6 m/s

A jack system will increase the potential energy of a heavy load by 1000 J with a work input of 2000 J. The efficiency of the jack system is a) 10 % b) 20 % c) 50 % d) 80 %

c) 50 %

The density of a 2-cubic meter block of mass of 1000 kg is a) 200 kg/m cubed b) 100 kg/m cubed c) 500 kg/m cubed d) 1000 kg/m cubed e) none of the above

c) 500 kg/m cubed

The power required to exert a 4-N force over 3 meters in 2 seconds is a) 8 W b) 4 W c) 6 W d) 12 W

c) 6 W

The change in momentum that occurs when a 1.0 kg ball traveling at 4.0 m/s strikes a wall and bounces back at 2.0 m/s is a) 2 kg m/s b) 4 kg m/s c) 6 kg m/s d) 8 kg m/s

c) 6 kg m/s

A 5000-kg freight car collides with a 10,000-kg freight car at rest. They couple upon collision and move at 2 m/s. What was the initial speed of the 5000-kg car? a) 4 m/s b) 5 m/s c) 6 m/s d) 8 m/s

c) 6 m/s

A bullet is fired horizontally with an initial velocity of 300 m/s from a 20-m high tower. If air resistance is negligible, the bullet hits downrange about a) 200 m b) 500m c) 600 m d) 300 m e) 400 m

c) 600 m

An unstretched hanging spring is 50 cm long. Suspending a 100-N block from it increases its length to 60 cm. Adding another 100-N block makes the spring's length a) 60 cm b) 100 cm c) 70 cm d) 120 cm e) 80 cm

c) 70 cm

A motorcycle moving at 50 km/h skids 10 m with locked brakes. How far will it skid with locked brakes when traveling at 150 km/h a) 50 m b) 10 m c) 90 m d) 30 m

c) 90 m

The planet Jupiter is about 300 times as massive as Earth, yet on its surface you would weigh only about 3 times as much. This is because a) your mass is 100 times less on Jupiter b) Jupiter is significantly farther from the Sun c) Jupiter's radius is about 10 times Earth's radius d) you are 100 times more weightless there

c) Jupiter's radius is about 10 times Earth's radius

The rotational inertia of a pencil is greater about an axis a) along its length, where the lead is b) about its midpoint, like a propeller c) about its end, like a pendulum

c) about its end, like a pendulum

The famous Leaning Tower of Pisa doesn't topple over because its center of gravity is a) stabilized by its structure b) in the same place as its center of mass c) above a place of support d) displaced from its center e) relatively low for such a tall building

c) above a place of support

We do not observe tides in a community swimming pool because a) gravitation on the small mass of water is negligibly small b) it is shallow compared to the ocean c) all parts of it are practically the same distance from the Moon d) they are masked by the much stronger pull of Earth gravity e) the tides are only observed at night

c) all parts of it are practically the same distance from the Moon

Rate this statement. No force due to Earth's gravity acts on astronauts inside the orbiting space station a) sometimes true while in orbit b) always true while in orbit c) always false

c) always false

Which produces more force: driving into a very massive concrete wall with no "give", or having a head-on collision with an identical car moving toward you at the same speed? a) a car b) wall c) both are the same d) need more info

c) both are the same

A very massive object A and a less massive object B move toward each other under the influence of gravity. Which force, if either, is greater? a) the force on A b) the force on B c) both forces are the same

c) both forces are the same

An egg rests at the bottom of a bowl filled with water. When salt is slowly added to the water the egg rises and floats, from which we conclude a) salt water is denser than fresh water b) salt water is denser than an egg c) both of these d) neither of these

c) both of these

If the Sun were twice as massive a) the pull of the Earth on the Sun would double b) its pull on Earth would double c) both of these d) neither of these

c) both of these

If the sun were twice as massive a) its pull on Earth would double b) the pull of Earth on the Sun would double c) both of these

c) both of these

The conservation of energy applies to satellites in a) circular orbit b) elliptical orbit c) both of these d) neither of these

c) both of these

The tapered shape of the wheel rims of trains that ride on railroad tracks allows opposite wheels to a) in effect, vary their diameters b) travel at different linear speeds for the same rotational speed c) both of these

c) both of these

Which task requires more work? a) lifting the 50 kg sack 2 meters b) lifting the 25-kg sack 4 meters c) both require the same

c) both require the same

To make a profit a buyer purchases metal by weight at an altitude and sells it at the same price per pound at another altitude. The supplier should a) it makes no difference b) buy at a low altitude and sell at a high altitude c) buy at a high altitude and sell at a low altitude

c) buy at a high altitude and sell at a low altitude

When an object is partly or wholly immersed in a liquid, it is buoyed up a) and floats in accord with Archimedes' principal b) by a force equal to its own weight c) by a force equal to the weight of liquid displaced d) all of the above

c) by a force equal to the weight of liquid displaced

A cannon recoils while firing a cannonball. The speed of the cannon's recoil is relatively small because the a) force against the cannon is smaller than against the ball b) momentum is mainly concentrated in the cannonball c) cannon has much more mass than the cannonball d) momentum of the cannon is smaller

c) cannon has much more mass than the cannonball

Centripetal force does no work on a circularly-moving object because a) no change in energy occurs b) rotational energy transfers to kinetic energy c) centripetal force has no component in the direction of motion

c) centripetal force has no component in the direction of motion

When you do somersaults, you'll more easily rotate when your body is a) straight with both arms above your head b) straight with both arms at your sides c) curled into a ball shape

c) curled into a ball shape

Whether a truck comes to a stop by crashing into a haystack or a brick wall, the stopping force is a) greater with the haystack b) both the same c) greater with the brick wall

c) greater with the brick wall

A lunar month is about 28 days. If the Moon were closer to Earth than it is now, the lunar month would be a) about 28 days b) more than 28 days c) less than 28 days d) need more information

c) less than 28 days

Support a horizontal toothpick at both ends. Then do likewise for a log of the same kind of wood. There is more sag in the a) toothpick b) same in each c) log

c) log

When Nellie hangs suspended from a pair of ropes that are not vertical, the tension in each rope is a) less than half her weight b) half her weight c) more than half her weight d) her weight

c) more than half her weight

When railroad tracks make a curve, the outer track is longer. This means a wheel that rides on the outer track needs to somehow a) roll slower than the wheel on the inner track b) maintain the same speed as the wheel on the inner track c) roll faster than the wheel on the inner track

c) roll faster than the wheel on the inner track

A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. The spring exerts the greater force on the a) lighter car b) heavier car c) same on each

c) same on each

No work is done by gravity on a bowling ball that rolls along a bowling alley because a) no force acts on the ball b) little distance is covered by the ball c) the force on the ball is at right angles to the ball's motion d) the ball's speed remains constant

c) the force on the ball is at right angle to the ball's motion

A hunter on level ground fires a bullet at an angle of 10 degrees above the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first? a) the one fired b) both hit at the same time c) the one dropped

c) the one dropped

If the Sun collapsed to a black hole, Earth's gravitational attraction to it would be A) more. B) less. C) the same.

c) the same

Professor DiNova projects a ball horizontally from a lab bench. The ball lands on a bullseye marked on the floor a horizontal distance away. Compared to the time for the ball to simply drop vertically from the bench, the time in the air for Professor DiNova's projected ball is a) greater b) less c) the same

c) the same

Passengers in a high-flying jumbo jet feel their normal weight in flight, while passengers in the orbiting space shuttle do not. This is because passengers in the space shuttle are a) beyond the main pull of Earth's gravity b) above Earth's atmosphere c) without support forces

c) without support forces

A coin and a ring roll down an incline at the same time. The one to first reach the bottom is the

coin

A projectile is launched from ground level at 15° above the horizontal and lands downrange. What other projection angle for the same speed would produce the same down-range distance? A) 30° B) 45° C) 50° D) 75° E) 90°

d) 75 *

A 2-kg ball is held 4 m above the ground. Relative to the ground its potential energy is a) 6 J b) 8 J c) 32 J d) 80 J

d) 80 J

A car traveling along the highway brakes to a stop over a certain distance. More braking force is required if the car has a) more mass b) more momentum c) less stopping distance d) all of the above e) none of the above

d) all of the above

A circus diver drops from a high pole into water far below. When he is halfway down a) his potential energy is halved b) he has gained an amount of kinetic energy equal to half his initial potential energy c) his kinetic energy and potential energy are equal d) all of the above

d) all of the above

As the sloped surface supporting a shoe becomes steeper a) the shoe's weight mg remains unchanged b) the normal force becomes less c) friction needed to keep it at rest increases d) all of the above e) none of the above

d) all of the above

Compared with a force, a torque involves a) rotation b) leverage c) distance from an axis of rotation d) all of the above

d) all of the above

The ram of a pile driver drops onto the top of an iron beam, driving it partway into the ground. The distance that the beam sinks into the ground depends on the a) initial potential energy of the rain b) initial height of the ram c) kinetic energy of the ram when it first hits the beam d) all of the above

d) all of the above

You experience weightlessness a) in a freely falling elevator b) momentarily when you step off a chair c) in the absence of a supporting surface d) all of the above

d) all of the above

A red car has a head-on collision with an approaching blue car with the same magnitude of momentum. A green car driving with the same momentum as the other cars collides with an enormously massive wall. Which of the three cars will experience the greatest impulse? a) red car b) blue car c) green car d) all the same

d) all the same

A ball gains speed while rolling down a hill due mainly to a) its rotational inertia b) its angular acceleration c) a balanced torque d) an unbalanced torque

d) an unbalanced torque

When Joshua brakes his speeding bicycle to a stop, kinetic energy is transformed to a) potential energy b) energy of motion c) energy of rest d) heat

d) heat

The amount of work done on a heavy box carried by Nellie across a room at a constant speed a) depends on the weight of the box b) depends on the distance walked c) depends on both weight of the box and distance walked d) is none

d) is none

An object has gravitational potential energy due to its a) speed b) acceleration c) momentum d) location

d) location

When Peter tosses an egg against a sagging sheet, the egg doesn't break due to a) reduced impulse b) reduced momentum c) both of these d) neither of these

d) neither of these

The least buoyant force on a rock is when it is submerged a) halfway to the bottom b) near the bottom c) near the surface d) none of above

d) none of the above

Half-way to the center of a planet of uniform density, your weight compared to that at the surface would be a) zero b) three-quarters c) one-quarter d) one-half e) the same as the surface

d) one-half

As a huge rotating cloud of particles in space gravitate together forming an increasingly dense ball, it shrinks in size and a) cannot rotate b) rotates slower c) rotates at the same speed d) rotates faster

d) rotates faster

Centrifugal forces are an apparent reality to observers in a reference frame that is a) moving at constant velocity b) an inertial reference frame c) at rest d) rotating

d) rotating

A ring, a disk, and a solid sphere begin rolling down a hill together. Which reaches the bottom first? a) all reach the bottom at the same time b) ring c) disk d) sphere

d) sphere

When Burl and Paul stand opposite ends of a scaffold, the tension in the ropes is

depend on the relative weights of Burl and Paul

While you stand on the floor you are pulled downward by gravity, and supported upward by the floor. Gravity pulling down and the support force pushing up

do NOT make an action reaction pair of forces

A moving object has a) speed b) velocity c) momentum d) energy e) all of these

e) all of these

A 1-kg ball dropped from 2 m rebounds only 1.5 m after hitting the ground. The amount of energy converted to heat is about a) 0.5 J b) 1.0 J c) 1.5 J d) 2.0 J e) more than 2.0 J

e) more than 2.0 J

A light aluminum ball and a heavy lead ball of the same size roll down an incline. When they are halfway down the incline, they will have identical a) kinetic energies b) potential energies c) momentum d) inertia e) none of the above

e) none of the above

Two planets in space gravitationally attract each other. If both the masses and distances are doubled, the force between them is a) one-quarter b) half as much c) twice as much d) four times as much e) none of the above

e) none of the above

When you and your snowboard are in motion , which of the following can be zero? a) kinetic energy b) inertia c) mass d) momentum e) none of the above

e) none of the above

The force that accelerates the orange and apply system featured in your textbook is actually supplied by the

floor

A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. Acceleration will be greater for the

lighter car

A rock is thrown vertically into the air. At the top of its path the net force on it is

mg

The most concentrated form of energy is

nuclear

The force exerted on the tires of a car that directly accelerate it along a road is exerted by the

road

A boy plays solitary seesaw by placing the seesaw's fulcrum one-eighth the distance from where he sits at one end. Which weighs more? a) they have equal weights b) the seesaw c) the boy

the boy

Weight is

the force of gravity upon object

The winner in a tug-of-war exerts the greatest force on

the ground

A rock dropped from a 5 m height accelerates at 10 m/s^2 and strikes the ground 1 second later. If the rock is dropped from a height of 2.5 m., its acceleration of fall is

the same

An automobile and a golf cart traveling at the same speed collide head-on. The impact force is a) greater on the automobile b) Greater on the golf cart c) the same for both

the same for both