Physical Science Unit 1- Speedback Quiz's

10-5 is the same number as

0.00001

In the picture below, there are 4 containers. The pressure is measured at the bottom of each container. If you put them in order of increasing pressure (smallest first, largest last) what is the correct order?

All the pressures are the same

In the pictures below, two charged balls are placed next to each other. The charge of the balls and the distance between the balls is accurately represented. The large ball has a mass of 2 kilograms; all other balls are 1 kilogram. Rank the pictures in order of the size of the force between the balls. In which picture will the electrical force between the two balls be the largest?

D

Scientists assume that physical laws are the same on earth and on Alpha Centauri, the closet star to our sun visible with the naked eye. This is an example of:

Position Symmetry

Your roommate asks you to taste the milk in the refrigerator to see if it is sour. What source of knowledge is he asking you to rely on?

Sensory data

At which of the points listed below would the net force on the sled be zero?

When you are moving at a constant speed

When would the boy's acceleration be directed backwards (opposite the direction he is moving)?

When he is slowing down

Which of the following statements are true? Select one: a. Moving objects are shorter than when they are at rest. b. Moving clocks run fast. c. Two events that are simultaneous on one reference frame are always simultaneous in another reference frame. d. Non-inertial reference frames do not exist.

a. Moving objects are shorter than when they are at rest.

Which is easier to accelerate? Select one: a. The cannonball requires more force to accelerate it as much as the marble. b. The cannonball requires less force to accelerate it as much as the marble. c. The cannon ball and the marble will accelerate the same amount in response to the same force.

a. The cannonball requires more force to accelerate it as much as the marble.

How does the gravitational force on the cannonball compare with that on the marble? Select one: a. The gravitational force on the cannonball is larger. b. The gravitational force on the cannonball is smaller. c. The gravitational force on the cannon ball is the same as the force on the marble.

a. The gravitational force on the cannonball is larger.

A stick of dynamite explodes. How does the momentum of the dynamite before the explosion compare to the total momentum of all of the pieces immediately after the explosion? Select one: a. The momentum is the same just before and just after the dynamite explodes. b. The momentum is larger after the explosion. c. The momentum is larger before the explosion.

a. The momentum is the same just before and just after the dynamite explodes.

The boy and the sled exert forces on each other. When would the contact force the sled exerts on the boy be equal to the contact force the boy exerts on the sled?

a. The two forces are always equal and opposite.

You are driving an automobile and you are making a left turn at constant speed. A package slides across the seat as a result of the turn. Which of the following is true? a. There would be no motion of the package relative to the seat if the force of friction were sufficiently great between the package and the seat. b. There would be no motion of the package relative to the seat if there were no forces acting on the package. c. The motion of the package relative to the seat is the result of a centrifugal force acting to the right (away from the turn) on the package. d. Neither the motion of the car nor the motion of the package is accelerated motion. e. Frictional forces are not important in situations like this.

a. There would be no motion of the package relative to the seat if the force of friction were sufficiently great between the package and the seat.

Two objects are attracted to each other by electromagnetic forces. Suppose I double the charge of one object. How can I return the force to its original value? Select one: a. by moving the objects farther apart. b. by moving the objects closer together. c. by doubling the charge of the second object. d. by doing nothing. The force doesn't change unless the charge of both objects changes. e. none of the above.

a. by moving the objects farther apart.

When a glass rod is rubbed with a piece of vinyl, the glass becomes positively charged. This occurs because: Select one: a. electrons are transferred from the glass to the vinyl. b. protons are transferred from the vinyl to the glass. c. electrons in the glass are annihilated by the protons in the vinyl. d. electrons are transferred from the vinyl to the glass. e. protons are transferred from the glass to the vinyl.

a. electrons are transferred from the glass to the vinyl.

When you rub a balloon in your hair, the balloon becomes negatively charged. What is the correct explanation for this charge? Select one: a. electrons are transferred from the hair to the balloon. b. protons are transferred from the balloon to the hair. c. electrons in the hair annihilate protons in the balloon. d. friction creates negative charges. e. the balloon is a conductor.

a. electrons are transferred from the hair to the balloon.

You sit on a hot stove. Energy is transferred into your seat by the process of Select one: a. heat conduction. b. work. c. convection. d. radiation. e. chemical reaction.

a. heat conduction.

Two objects are attracted to each other by gravitational forces. Suppose I double the mass of one of the objects. This changes the gravitational forces between them. I can make this force the same as it was at first, however, by Select one: a. increasing the distance between the two objects. b. decreasing the distance between the two objects. c. increasing the mass of the other object. d. doing nothing--the force is not changed unless I change the mass of both objects, since the gravitational force depends on both these masses. e. decreasing the distance between the objects and increasing the mass of the other object.

a. increasing the distance between the two objects.

A ball is rolling along the highway. From this information you know that Select one: a. it has kinetic energy. b. its gravitational potential energy is decreasing. c. its thermal internal energy is decreasing. d. its kinetic energy is increasing. e. its gravitational potential energy is increasing.

a. it has kinetic energy.

A person gets into the boat. As the boat sinks deeper into the water, what happens to the pressure on the bottom surface of the boat? Select one: a. it increases b. it decreases c. it remains the same

a. it increases

What happens to the pressure on the block as it is pushed deeper into the water? Select one: a. it increases. b. it decreases. c. it stays the same. d. it changes from upward to zero e. it changes from upward to downward

a. it increases.

All objects weigh less near the surface of the moon than the same objects weigh near the surface of the earth. This is because Select one: a. the moon has less mass than the earth. b. the moon has a smaller radius than the earth. c. there is less air on the moon's surface. d. the universal gravitational constant is smaller near the moon. e. the buoyant force on the moon is greater than on earth.

a. the moon has less mass than the earth.

Now the elevator and the girl standing on the scale are mid-floor and are moving at a constant speed upward. Which choice properly describes her weight, contact force, and acceleration at this point? Select one: a. weight = 130 lbs downward, contact force = 130 lbs upward, acceleration is zero b. weight = 130 lbs downward, contact force = 130 lbs upward, acceleration is downward c. weight = 130 lbs downward, contact force = 130 lbs upward, acceleration is upward d. weight = 140 lbs downward, contact force = 130 lbs upward, acceleration is downward e. weight = 140 lbs downward, contact force = 130 lbs upward, acceleration is upward f. weight = 130 lbs downward, contact force = 140 lbs upward, acceleration is upward g. weight = 130 lbs downward, contact force = 140 lbs upward, acceleration is downward

a. weight = 130 lbs downward, contact force = 130 lbs upward, acceleration is zero

The contact force is caused by: Select one: a. Atoms randomly crashing into each other b. Electrons of two atoms repelling each other c. Protons of two atoms repelling each other d. The force of one object pushing against the force of another object.

b. Electrons of two atoms repelling each other

Now two helpful Physical Science 100 students happen to see the plight of the elephant and the ant on the ice and decide to help them. The two students exert a force on the elephant of 1 N and a force on the ant of 1 N. Which of the following statements is true? a. The elephant will stop first due to its larger mass. b. The ant will stop first due to its smaller mass. c. The elephant and ant will stop at the same time. d. Neither the elephant nor the ant will not stop and will continue at 1 mile per hour as long as the ice lasts.

b. The ant will stop first due to its smaller mass.

Which one of the following is classified as an electrical force? a. The force holding stars together in a galaxy. b. The force attracting the electrons to the nucleus in an atom. c. The force holding the sun and planets together in a solar system. d. The force holding protons and neutrons together in a nucleus.

b. The force attracting the electrons to the nucleus in an atom. Correct

A heavy rock is lying under water on the bottom of a swimming pool. Which of the following is correct? Select one: a. The rock is harder to lift when it is under water than it would be on dry land because the water pressure pushing down on it helps hold it down. b. The rock is easier to lift when it is under water than it would be on dry land because the buoyant force of the water pushing on the rock helps to push it upward. c. It requires no more force to lift a rock under water than it does on dry land, and also it requires no less force--the situation is the same in either case. d. The rock is significantly easier to lift when it is under water because its actual weight is less in water--the earth pulls on it differently. e. The rock is significantly harder to lift when it is under water because the buoyant force acts in addition to its weight, making a greater force necessary.

b. The rock is easier to lift when it is under water than it would be on dry land because the buoyant force of the water pushing on the rock helps to push it upward.

A skier is skiing downhill, with friction. From this information, which of the following must be true? Select one: a. his kinetic energy is decreasing. b. his gravitational potential energy is decreasing. c. his kinetic energy is increasing. d. internal energy is decreasing. e. electrical potential energy is increasing.

b. his gravitational potential energy is decreasing.

If a block of wood floats with half its volume submerged, Select one: a. the buoyant force is equal to half the weight of the block. b. the weight of the block is the same as that of the displaced water. c. the volume of the block is the same as that of the displaced water. d. the buoyant force is equal to twice the weight of the displaced water. e. the buoyant force is equal to twice the weight of the block.

b. the weight of the block is the same as that of the displaced water.

The light clock experiment is a thought experiment that illustrates Select one: a. length expansion. b. time dilation. c. mass increase. d. anomalous dispersion. e. motion symmetry.

b. time dilation.

Suppose an object is moving away from you with a speed near the speed of light. Which of the following choices is true? Select one: a. Its mass is less than when it is at rest. b. Its length is longer than when it is at rest. c. A clock traveling with the object seems to run slower than when the object is at rest. d. All of these are true. e. None of these is true.

c. A clock traveling with the object seems to run slower than when the object is at rest.

When the dynamite explodes, what happens to its mass? Select one: a. A measurable amount of the mass is destroyed in the explosion. b. The mass increases as a result of the explosion. c. All of the mass is still there, but some of the atoms have recombined into different molecules and dissipated through the air.

c. All of the mass is still there, but some of the atoms have recombined into different molecules and dissipated through the air.

Where is the kinetic energy of the pendulum the largest? Select one: a. At the highest point in the swing (point A). b. In the middle of the swing (point B). c. At the lowest point in the swing (point C). d. The pendulum has no kinetic energy. e. The pendulum has constant kinetic energy throughout its motion.

c. At the lowest point in the swing (point C).

A driver in a Volkswagen bug (mass = 1335 kg) pulls out going 10 miles per hour in front of a Ford pickup truck (mass = 2675 kg) which is traveling 40 miles per hour. The two vehicles experience a head-on collision. Which of the following statements is true concerning the forces that each vehicle (and driver) experience in this collision?: a. The Volkswagen bug experiences a much greater force than the Ford pickup truck due to the greater speed of the truck. b. The Volkswagen bug experiences a much greater force than the Ford pickup truck due to the larger mass of the truck. c. The Volkswagen bug experiences a force that is the same as the Ford pickup truck experiences d. The Volkswagen bug experiences a much smaller force than the Ford pickup truck due to the smaller speed of the Volkswagen bug. e. The Volkswagen bug experiences a much smaller force than the Ford pickup truck due to the smaller mass of the Volkswagen bug.

c. The Volkswagen bug experiences a force that is the same as the Ford pickup truck experiences

A bullet is fired horizontally from a high-powered rifle. At the same time, a second bullet is simply dropped from the same height as the bullet which was fired from the rifle. Neglecting air resistance, which statement is true about the acceleration of the first bullet after it leaves the gun compared to that of the second bullet as it falls? Select one: a. The acceleration of the first bullet is much less than the acceleration of the bullet that was dropped. b. The acceleration of the first bullet is a little less than the acceleration of the bullet that was dropped. c. The acceleration of the first bullet is the same as the acceleration of the bullet that was dropped. d. The acceleration of the first bullet is a little more than the acceleration of the bullet that was dropped. e. The acceleration of the first bullet is much more than the acceleration of the bullet that was dropped.

c. The acceleration of the first bullet is the same as the acceleration of the bullet that was dropped.

In this same head-on collision between the Volkswagen bug and the Ford pickup truck, which of the following statements is true concerning the acceleration of the pickup truck and Volkswagen bug? a. The acceleration of the truck is much greater than that of the Volkswagen bug. b. The acceleration of the truck is the same as that of the Volkswagen bug. c. The acceleration of the truck is much less than that of the Volkswagen bug. d. The truck experiences no acceleration but the Volkswagen bug experiences a large acceleration.

c. The acceleration of the truck is much less than that of the Volkswagen bug.

Now this same block of wood that was floating with one half of its volume out of the water is pushed down so that it is completely underneath the water. Which of the following statements is correct? Select one: a. The buoyant force on the block is the same in the two cases because the weight per unit volume of the wood has not changed. b. The buoyant force on the block is the same in the two cases because the weight per unit volume of the water is the same in each case. c. The buoyant force on the block is greater when the block is completely submerged than it is when the block is floating. d. The buoyant force on the block is greater when it is floating than when it is totally submerged. e. The buoyant force on the block is the same in the two cases because the block loses weight as it is submerged.

c. The buoyant force on the block is greater when the block is completely submerged than it is when the block is floating.

The pictures below show the position of a car at equal time intervals. In which of the pictures below is the car accelerating?

c. The car is accelerating in pictures 1 and 4. (the car is at a stop and is them moving forward, and then the car is going up a hill)

A train moving near the speed of light enters a tunnel. According to a person standing in the middle of the tunnel, the back end of the train enters the tunnel just as the front end is emerging. What happens according to someone sitting in the middle of the train? Select one: a. The back end enters the tunnel at the same time as the front end emerges. b. The back end enters the tunnel before the front end emerges. c. The front end leaves the tunnel before the back end enters. d. The front end leaves the tunnel at the same time the back end passes the person standing in the middle of the tunnel. e. The front and back ends of the train enter the tunnel at the same time.

c. The front end leaves the tunnel before the back end enters.

The next three questions, Questions 2 - 4, relate to a cannon ball and a marble that are dropped from the same height at the same time. Both are originally at rest. Ignore air friction. How do the speed and acceleration of the cannonball compare with those of the marble at any given time after they are dropped? Select one: a. The speed and acceleration of the cannonball are both greater than those of the marble. b. The speed and acceleration of the cannonball are both smaller than those of the marble. c. The speed and acceleration of the cannonball are both the same as those of the marble. d. The speed of the cannonball is the same, but the acceleration is larger. e. The acceleration of the cannonball is the same, but the speed is larger.

c. The speed and acceleration of the cannonball are both the same as those of the marble.

As a body moves higher and higher above the surface of the earth, Select one: a. its weight increases. b. its mass increases. c. its weight decreases. d. its mass decreases. e. both its weight and its mass decrease.

c. its weight decreases.

A distant star is moving toward the earth at a speed of 1/4 the speed of light. Compared to the light from a flashlight on the earth, the speed of the light from the star would be Select one: a. 1/4 as fast. b. 3/4 as fast. c. the same. d. 1 1/4 times as fast. e. 1 3/4 times as fast.

c. the same.

A raindrop, as it falls to the ground, reaches a speed known as terminal velocity where the speed of the raindrop is neither increasing nor decreasing. This motion of the raindrop at terminal velocity can be understood in terms of: Select one: a. one vertical force b. one horizontal force c. two vertical forces which balance d. two vertical forces which do not balance e. two horizontal forces which balance f. two horizontal forces which do not balance

c. two vertical forces which balance

Which of the following choices would be third in size, if you were to rank them from smallest to largest? a. galaxy b. quark c. solar system d. person e. molecule f. cell

cell

In a certain nuclear reaction, a radioactive nucleus with a net charge of +6 decays, emits an electron (-1 charge) and a neutrino (no charge), and turns into a nucleus that has a net charge of which of the following choices? (Hint: think about Conservation of Charge. Drawing a picture may help.) Select one: a. -1 b. +1 c. +6 d. +7

d. +7

A piece of wood is burned in a fireplace. Which of the following is true about the situation? Select one: a. Mass is conserved. b. Total energy is conserved. c. Electric charge is conserved. d. All of the above are conserved. e. None of the above are conserved.

d. All of the above are conserved.

When a spinning figure skater pulls her arms in, she spins faster. Which law applies here? Select one: a. Newton's 1st law b. Newton's 2nd law c. Newton's 3nd law d. Conservation of Angular Momentum e. Conservation of Energy

d. Conservation of Angular Momentum

A passenger in the Volkswagen is not wearing a seat belt. He is thrown toward the windshield. Which of the following is a correct explanation for this occurrence? a. The impact exerts a forward force on the occupants of the car. b. The car is still exerting a forward force on him for a short time after the accident, and this force propels him forward. c. The force of impact is backward, so there is an opposite and equal force forward on the occupants. d. He is not thrown forward. He just keeps moving in the direction he was originally going until something, like the windshield, stops him.

d. He is not thrown forward. He just keeps moving in the direction he was originally going until something, like the windshield, stops him.

Suppose an elephant and an ant are both running at 1 mile per hour when they both encounter a long patch of slick ice where friction can be neglected. They begin to slide on the ice. Which of the following statements is true concerning their motion? a. The elephant will stop first due to its larger mass. b. The ant will stop first due to its smaller mass. c. The elephant and ant will stop at the same time. d. Neither the elephant nor the ant will not stop and will continue at 1 mile per hour as long as the ice lasts.

d. Neither the elephant nor the ant will not stop and will continue at 1 mile per hour as long as the ice lasts.

The boat from the question above springs a leak and sinks completely. What happens to the buoyant force? Select one: a. The buoyant force on the boat does not change because the weight per unit volume of the material it is made of has not changed. b. The buoyant force on the boat does not change because the weight per unit volume of the water is the same in each case. c. The buoyant force on the boat is greater when the boat is completely submerged than it is when the boat is floating. d. The buoyant force on the boat is smaller because it doesn't displace as much water after it sinks. e. The buoyant force on the boat does not change because the boat weighs less when it is submerged.

d. The buoyant force on the boat is smaller because it doesn't displace as much water after it sinks.

Which of the following best describes the Strong interaction : a. The force between action reaction pair. b. A force between objects with mass. c. The force between two accelerating objects. d. The force that holds the nucleus of an atom together. e. The force between two charged particles.

d. The force that holds the nucleus of an atom together. Correct

Which of the following best explains what happens at the bottom of the hill?

d. The sled slowly comes to rest because of a net force acting backwards.

In convection currents, warmer air rises and cooler air descends. Which of the following is correct? Select one: a. There is a buoyant force on the warmer air, but there is not a buoyant force on the cooler air. b. The gravitational force pulls harder on each kilogram of cooler air than it does on a kilogram of warmer air. c. The buoyant force on the warmer air is upward, while the buoyant force on the cooler air is downward. d. The warmer air has a lower density than the cooler air which it displaces. e. The warmer air has a higher density than the cooler air which it displaces.

d. The warmer air has a lower density than the cooler air which it displaces.

You are in a spaceship moving in a straight line at constant speed. You cannot see out of the ship. Assuming perfectly uniform motion, which of the following is true? Select one: a. You could determine that you are moving by measuring changes in the motion of a ball thrown parallel to the direction you are traveling. b. You could determine that you are moving by measuring changes in the motion of a ball thrown perpendicular to the direction you are traveling. c. You could determine that you are moving by measuring the change in length of the ship you are in. d. There is no experiment you can do to determine that you are moving. e. (B) and (C) are both correct.

d. There is no experiment you can do to determine that you are moving.

Which of the following quantities is conserved? Select one: a. Linear momentum of the pendulum b. Angular momentum of the pendulum c. Potential energy of the pendulum d. Total energy of the pendulum e. All of the above

d. Total energy of the pendulum

According to principle of non-contradiction, if two ideas contradict each other, which of the following statements is true? a. both statements must be false b. both statements must be true c. one statement must be false and the other statement must be true d. one statement must be false e. the simplest statement must be true

d. one statement must be false

A mass on a spring is bouncing up and down. Which of the following are conserved? Select one: a. the elastic energy b. the gravitational potential energy c. the kinetic energy d. the total energy

d. the total energy

A man standing on the ground sees two lightning flashes simultaneously, 1 kilometer to the east and 1 kilometer to the west of where he is standing. Since he sees the light simultaneously, and it travels equal distances, he concludes that the lightning hits the ground at exactly the same time in the two locations. What happens according to a man driving by, east to west, very close to the speed of light? Select one: a. According to the driver, the flashes occur and are seen simultaneously. b. According to the driver, the flashes occur simultaneously, but are seen at two different times. The east flash is seen first, and the west flash is seen last. c. According to the driver, the flashes occur simultaneously, but are seen at two different times. The west flash is seen first and the east flash is seen last. d. According to the driver, the flashes occur at different times and the west flash occurs last. e. According to the driver, the flashes occur at different times and the west flash occurs first.

e. According to the driver, the flashes occur at different times and the west flash occurs first.

Which one of the following statements is true? Select one: a. The electrical potential energy of two similar charges is increased when they are moved farther apart. b. The gravitational potential energy of a falling object is increasing. c. Work done by friction is often responsible for converting internal energy into kinetic energy. d. The internal energy of a given object is increased by lowering its temperature. e. None of the above are true.

e. None of the above are true.

A girl stands in an elevator on a scale as the elevator just begins to move upward from the first to second floor. Which choice properly describes her weight, contact force, and acceleration at this instant? Select one: a. weight = 130 lbs downward, contact force = 130 lbs upward, acceleration is zero b. weight = 130 lbs downward, contact force = 130 lbs upward, acceleration is downward c. weight = 130 lbs downward, contact force = 130 lbs upward, acceleration is upward d. weight = 140 lbs downward, contact force = 130 lbs upward, acceleration is downward e. weight = 130 lbs downward, contact force = 140 lbs upward, acceleration is upward f. weight = 130 lbs downward, contact force = 140 lbs upward, acceleration is downward

e. weight = 130 lbs downward, contact force = 140 lbs upward, acceleration is upward

As the elevator approaches the second floor, it begins to slow to a stop. Which choice properly describes her weight, contact force, and acceleration at this point? Select one: a. weight = 130 lbs downward, contact force = 130 lbs upward, acceleration is zero b. weight = 130 lbs downward, contact force = 130 lbs upward, acceleration is downward c. weight = 130 lbs downward, contact force = 130 lbs upward, acceleration is upward d. weight = 140 lbs downward, contact force = 130 lbs upward, acceleration is downward e. weight = 140 lbs downward, contact force = 130 lbs upward, acceleration is upward f. weight = 130 lbs downward, contact force = 120 lbs upward, acceleration is upward g. weight = 130 lbs downward, contact force = 120 lbs upward, acceleration is downward

g. weight = 130 lbs downward, contact force = 120 lbs upward, acceleration is downward

A medium sized star is rotating about its axis (similar to how the earth rotates about its axis once each day). At the end of its life, it collapses into something called a neutron star which has a much smaller radius than the original star. In the process, there are not forces which would, of themselves, speed up or slow down the rotation of the star. Considering conservation of angular momentum, we would expect the rotation speed of the star to Select one: a. increase. b. decrease. c. stay the same. d. increase or decrease.

increase