PHY 110 Final Chapters 1-8
A 10 -N falling object encounters 10 N of air resistance. The net force on the object is Select one: a. 0 N b. 4 N c. 6 N d. 10 N e. 20 N
a
A Mack truck and a Volkswagon traveling at the same speed have a head-on collision. The vehicle that undergoes the greatest change in velocity will be the Select one: a. Volkswagon b. Mack truck c. the same for both
a
A bird flies 5 km in 30 min. Its average speed is Select one: a. 10 km/hr b. 15 km/hr c. 20 km/hr d. 25 km/hr e. 30 km/hr
a
A light woman and a heavy man jump from an airplane at the same time and open their same-size parachutes at the same time. Which person will get to a state of zero acceleration first? Select one: a. the light woman b. the heavy man c. both should arrive at the same time
a
A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration in meters per second per second is Select one: a. zero b. 4.9 c. 9.8 d. infinite
a
A scientific theory is Select one: a. a well-tested and verified hypothesis b. an unproven hypothesis c. an educated guess d. the result of a single experiment
a
At one instant a heavy object in air is moving upward at 50 meters per second. One second later its speed in meters per second is approximately Select one: a. 40 m/s b. 50 m/s c. 60 m/s d. 55 m/s Feedback
a
If a monkey floating in outer space throws his hat away, the hat and the monkey will both Select one: a. move away from each other at different speeds b. move away from each other at equal speeds c. move a short distance, then slow down d. move a short distance, then speed up e. come to rest after a few minutes
a
If a projectile is fired straight up at a speed of 10 m/s, the time it takes to reach the top of its path is about Select one: a. 1 second b. 2 seconds c. 10 seconds d. not enough information is given
a
If the polar icecaps melted, the resulting water would spread over the entire earth. This new mass distribution would tend to make the length of a day Select one: a. longer b. shorter c. stay the same d. shorter at first, then longer
a
If you push an object a given distance, while applying twice the force, you do Select one: a. twice as much work b. four times as much work c. the same amount of work d. half as much work
a
If you push for a half hour or a whole hour against a stationary wall Select one: a. no work is done in either case b. half as much work is done during the half hour c. twice as much work is done during the half hour d. it is impossible to determine how much work is done
a
If your car runs out of fuel while you are driving, the engine stops but you do not come to an abrupt stop. The concept that most explains why is Select one: a. inertia b. gravity c. acceleration d. air resistance
a
On a balanced see saw, a boy three times as heavy as his partner sits Select one: a. 1/3 the distance from the fulcrum b. less than 1/3 the distance from the fulcrum c. more than 1/3 the distance from the fulcrum
a
Padded dashboards in cars are safer in an accident than non-padded ones because an occupant hitting the dash has Select one: a. increased time of impact b. decreased time of impact c. decreased impulse d. increased momentum
a
The mass of a pet turtle that weighs 10 N is Select one: a. about 1 kg b. about 10 kg c. about 100 kg d. about 1000 kg
a
The power required to exert 1 N force, over a distance of 1 m in 1 second is Select one: a. 1 W b. 2 W c. 1/3 W d. 3 W
a
When a twirling ice skater brings her arms inward, her rotational speed Select one: a. increases b. decreases c. stays the sam
a
The Leaning Tower of Pisa doesn't topple over because its center of gravity is Select one: a. above a place of support b. relatively low for such a tall building c. stabilized by its structure d. displaced from its center
a. above a place of support
Your pet hamster sits on a record player whose anular speed is constant. If he moves to a point twice as far from the center, then his linear speed Select one: a. doubles b. halves c. remains the same
a. doubles
As an object freely falls downward, its Select one: a. velocity increases b. acceleration increases c. both d. neither
a. velocity increases
A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is Select one: a. zero b. 10 km/hr c. 100 km/hr d. 110 km/hr e. 1000 km/hr
a. zero
A block of ice sliding down an incline has its maximum speed at Select one: a. the top b. the bottom c. halfway down d. depends on the slope of the incline
b
A car travels in a circle with constant speed. The net force on the car is Select one: a. directed forward, in the direction of travel b. directed toward the center of the curve c. zero because the car is not accelerating
b
A heavy object and a light object are dropped at the same time from rest in a vacuum. The heavier object reaches the ground Select one: a. sooner than the lighter object b. at the same time as the lighter object c. later than the lighter object
b
A huge rotating cloud of particles in space gravitate together to form an increasignly dense ball. As it shrinks in size, the cloud Select one: a. rotates faster b. rotates slower c. rotates at the same speed
b
A push on a 1-kg brick accelerates it. Neglecting friction, to equally accelerate a 10-kg brick, one would have to push with Select one: a. just as much force b. 10 x more force c. 100 x more force d. 1/10 as much force
b
A rock is thrown vertically into the air. At the top of its path, its acceleration in meters per second per second is Select one: a. zero b. 9.8 c. between 0 and 9.8 d. more than 9.8
b
A rock weighs 30 N on Earth. A second rock weighs 30 N on the moon. Which of the two rocks has the greater mass? Select one: a. The one on Earth. b. The one on the Moon. c. They have the same mass.
b
An object is pulled northward by a force of 10 N and at the same time another force of 15 N pulls it southward. The magnitude of the resultant force on the object is Select one: a. 0 N b. 5 N c. 25 N d. 150 N
b
Drop a rock from a 5-m height and it accelerates at 10 m/s2, striking the ground 1 s later. Drop the same rock from a height of 2.5 m and its falling acceleration is about Select one: a. half as much b. the same c. twice as much d. four times as much
b
Horses that move with the fastest linear speed on a merry-go-round are located Select one: a. near the center b. near the outside c. anywhere, because they all move at the same speed
b
It is correct to say that impulse is equal to Select one: a. momentum b. change in momentum c. the force multiplied by the distance over which the force acts d. velocity multiplied by time
b
It takes 40 J to push a large box 4 m across a floor. Assuming the push is in the same direction as the move, what is the magnitude of the force on the box? Select one: a. 4 N b. 10 N c. 40 N d. 160 N
b
Suppose the circumference of a bicycle wheel is 2 meters. If it rotates at 1 revolution per second when you are riding the bicycle, then your speed will be Select one: a. 1 m/s b. 2 m/s c. 3 m/s d. 3.14 m/s e. 6.28 m/s
b
The easiest way for you to measure the distance between the earth and the moon is to place in your line of sight to the moon a Select one: a. magnifying glass b. coin c. telescope d. meter stick
b
When you jump from an elevated position you usually bend your knees upon reaching the ground. By doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. In this way the average force your body experiences is Select one: a. less than 1/10 as great b. about 1/10th as great c. about ten times as great d. more than 10 times as great
b
Whenever the net force on an object is zero, its acceleration Select one: a. may be less than zero b. is zero c. may be more than zero
b
Whirl a rock at the end of a string on an ice-covered pond and it follows a circular path. If the string breaks, the tendency of the rock is to Select one: a. conitnue to follow a circular path b. follow a straight-line path c. follow a wave-shaped path
b
What distinguishes science from other areas of learnign? Select one: a. the use of mathematics b. experimentation as the ultimate test of truth c. no prior assumptions d. the use of technology
b. experimentation as the ultimate test of truth
If an object's mass is decreasing while a constat force is applied to the object, the acceleration Select one: a. decreases b. increases c. remains the same
b. increases
A torque acting on an object tends to produce Select one: a. equilibrium b. rotation c. linear motion d. velocity e. center of gravity
b. rotation
Compared to the mass of a certain object on Earth, the mass of the same object on the moon is Select one: a. one sixth as much b. the same c. six times as much d. zero
b. the same
To kick a football so it won't topple end over end, kick it so the force of impact extends Select one: a. above its center of gravity b. through its center of gravity c. below its center of gravity
b. through its center of gravity
A 5-kg fish swimming at a speed of 1 m/s swallows an absent-minded 1-kg fish at rest. the speed of the larger fish after this lunch is Select one: 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
A 5000-kg freight car runs into a 10,000-kg freight car at rest. They couple upon collision and move with a speed of 2 m/s. What was the initial speed of the 5000-kg car? Select one: a. 4 m/s b. 5 m/s c. 6 m/s d. 8 m/s
c
A ball is moving at 3 m/s and has a momentum of 48 kg m/s. What is the ball's mass? Select one: a. 4 kg b. 12 kg c. 16 kg d. 144 kg
c
A baseball player bats a ball with a force of 1000 N. The reaction force that the ball exerts against the bat is Select one: a. less than 1000 N b. more than 1000 c. 1000 N d. impossible to determine
c
A bow is drawn so that it has 40 J of potential energy. When fired, the arrow will ideally have a kinetic energy that is Select one: a. less than 40 J b. more than 40 J c. 40 J d. need additional information
c
A carnival has a Ferris Wheel where the seats are located halfway between the center and outside rim. Compared with a Ferris wheel with seats on the outside rim, your angular speed while ridiing on this Ferris wheel would be Select one: a. less and your tangential spped mre b. more and your tangential speed less c. the same and your tangential speed less.
c
A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is Select one: a. zero b. about 15 m/s c. about 30 m/s d. about 45 m/s e. more information is needed for an estimate
c
A player hits a ball with a bat. the action force is the impact of the bat against the ball. The reaction to this force is the Select one: a. air resistance on the ball b. weight of the ball c. force that the ball exerts on the bat d. grip of the player's hand against the ball e. weight of the bat
c
A rifle recoils while firing a bullet. The speed of the rifle's recoil is small because the Select one: a. force against the rifle is smaller than against the bullet b. momentum is mainly concentrated in the bullet c. rifle has much more mass than the bullet d. momentum of the rifle is smaller
c
A ring, a disk, and a solid sphere begin rolling down a hill together. The one to reach the bottom first is the Select one: a. ring b. disk c. sphere d. all reach the bottom at the same time e. need more information
c
A tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters per second per second. What is the mass of the car? Select one: a. 500 kg b. 1000 kg c. 1500 kg d. 3000 kg e. 6000 kg
c
An automobile and a baby carriage traveling at the same sped collide head-on. The impact force is Select one: a. greater on the augomobile b. greater on the baby carriage c. the same for both
c
An object lifted 10 m gains 200 J of potential energy. If the same object is lifted 20 m, its potential energy gain is Select one: a. half as much b. the same c. Twice as much d. four times as much.
c
As a ball falls, the action force is the pull of the Earth's mass on the ball. The reaction force is the Select one: a. air resistance acting agianst the ball b. acceleration of the ball c. pull of the ball's mass on the Earth d. none of the above
c
The force of friction on a sliding object is 10 Newtons. The applied force needed to maintain a constant velocity is Select one: a. more than 10 N b. less than 10 N c. about 10 N
c
The gain in speed each second for a freely-falling object is about Select one: a. 0.0 b. 5 m/s c. 10 m/s d. 20 m/s e. depends on initial speed
c
The human body can, under certain conditions, wihstand an acceleration of 10 g (ten times the gravitational acceleration, or (10)(9.8)). What force would produce this acceleration of a 50-kg person? Select one: a. about 500 N b. about 2500 N c. about 5000 N d. about 25,00 N
c
A 1-kg mass at the Earth's surface weighs Select one: a. 1 N b. 4.9 N c. 9.8 N d. 10.8 N
c. 9.8 N
The two measurements necessary for calculating average speed are Select one: a. acceleration and time b. velocity and time c. distance and time d. distance and acceleration e. velocity and distance Feedback
c. distance and time
After rolling halfway down an incline, a marble's kinetic energy is Select one: a. less than its potential energy b. greater than its potential energy c. the same as its potential energy
c. the same as its potential energy
A heavy object and a light object released from the same height in a vacuum have equal Select one: a. weights b. momenta c. kinetic energies d. accelerations e. none of the above
d
An object may have potential energy because of it Select one: a. speed b. acceleration c. momentum d. location
d
Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much Select one: a. inertia b. mass c. volume d. all of the above e. none of the above
d
Twelve seconds after starting from rest, an object falling freely will have a speed of Select one: a. 10 m/s b. 50 m/s c. 100 m/s d. more than 100 m/s
d
A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that Select one: a. the milk carton has no acceleration b. there is an action-reaction pair of forces c. gravity tends to hold the milk carton secure d. the milk carton has inertia e. none of these
d. the milk carton has inertia
An object at rest may also have Select one: a. speed b. velocity c. momentum d. kinetic energy e. potential energy f. all of the above g. none of the above
e
a large heavy truck and a small baby carriage roll down a hill. Neglecting friction, at the bottom of the hill, the baby carriage will have a greater Select one: a. speed b. acceleration c. momentum d. all of these e. none of these
e
A moving object has Select one: a. speed b. velocity c. momentum d. energy e. all of the above Feedback
e. all of the above