Question 1

Half way to the center of a planet of uniform density,your weight compared to that at the surface would be

Accepted Answer

A) one-quarter. 
B) one-half. 
C) three-quarters. 
D) the same as at the surface. 
E) zero. 
A) one-quarter. 
B) one-half. 
C) three-quarters. 
D) the same as at the surface. 
E) zero.

Question 2

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

Accepted Answer

A) your mass is 100 times less on Jupiter. 
B) Jupiter is significantly farther from the sun. 
C) Jupiter's radius is 10 times the Earth's radius. 
D) you are 100 times more weightless there. 
E) none of these 
A) your mass is 100 times less on Jupiter. 
B) Jupiter is significantly farther from the sun. 
C) Jupiter's radius is 10 times the Earth's radius. 
D) you are 100 times more weightless there. 
E) none of these

Question 3

The concept of force is not fundamental to

Accepted Answer

A) Newton's theory of gravitation. 
B) Einstein's theory of gravitation. 
C) both of these 
D) neither of these 
A) Newton's theory of gravitation. 
B) Einstein's theory of gravitation. 
C) both of these 
D) neither of these

Question 4

If the moon were covered with water,tidal effects caused by the Earth would find the moon with

Accepted Answer

A) 1 tidal bulge. 
B) 2 tidal bulges. 
C) 3 tidal bulges. 
D) 4 tidal bulges. 
E) no tidal bulges. 
A) 1 tidal bulge. 
B) 2 tidal bulges. 
C) 3 tidal bulges. 
D) 4 tidal bulges. 
E) no tidal bulges.

Question 5

A supplier wants to make a profit by buying metal by weight at one altitude and selling it at the same price per pound at another altitude.The supplier should

Accepted Answer

A) buy at a high altitude and sell at a low altitude. 
B) buy at a low altitude and sell at a high altitude. 
C) disregard altitude because it makes no difference. 
A) buy at a high altitude and sell at a low altitude. 
B) buy at a low altitude and sell at a high altitude. 
C) disregard altitude because it makes no difference.

Question 6

No force due to Earth's gravity is acting on the astronauts inside the orbiting space shuttle.This statement is

Accepted Answer

A) always true while in orbit. 
B) sometimes true while in orbit. 
C) always false. 
A) always true while in orbit. 
B) sometimes true while in orbit. 
C) always false.

Question 7

If a block is set sliding on a huge frictionless plane in contact with the Earth,it will NOT continue to move at constant speed because

Accepted Answer

A) of its inertia. 
B) gravity will pull in a non-perpendicular direction as the block gets farther out on the plane. 
C) gravity gets weaker as distance increases. 
D) it is not free from the shackles of Earth's gravity. 
A) of its inertia. 
B) gravity will pull in a non-perpendicular direction as the block gets farther out on the plane. 
C) gravity gets weaker as distance increases. 
D) it is not free from the shackles of Earth's gravity.

Question 8

The force of gravity acts on all apples on an apple tree.Some apples are twice as far from the ground as others.These twice-as-high apples,for the same mass,have

Accepted Answer

A) 1/4 the weight. 
B) 1/2 the weight. 
C) practically the same weight. 
A) 1/4 the weight. 
B) 1/2 the weight. 
C) practically the same weight.

Question 9

A very massive object A and a less massive object B move toward each other under the influence of gravitation.Which force,if either,is greater?

Accepted Answer

A) the force on A 
B) the force on B 
C) Both forces are the same. 
A) the force on A 
B) the force on B 
C) Both forces are the same.

Question 10

The factor most directly responsible for making a black hole invisible is its

Accepted Answer

A) size. 
B) mass. 
C) color. 
D) surface escape velocity. 
E) none of these 
A) size. 
B) mass. 
C) color. 
D) surface escape velocity. 
E) none of these

Question 11

The origin of any micro tides in the human body is most likely the

Accepted Answer

A) sun. 
B) moon. 
C) Earth. 
A) sun. 
B) moon. 
C) Earth.

Question 12

A long,perfectly level,frictionless bowling alley,over 2000 meters long,is built by a group of students as a class project.The center of the alley just touches the Earth near their school and the ends of the alley extend tangentially into outer space.A bowling ball released at either end starts rolling towards the center of the alley and will continue moving

Accepted Answer

A) indefinitely. 
B) until it strikes the pins at the far end and stops. 
C) for a while but slows to a stop before reaching the pins. 
A) indefinitely. 
B) until it strikes the pins at the far end and stops. 
C) for a while but slows to a stop before reaching the pins.

Question 13

According to Newton,the greater the masses of interacting objects,the

Accepted Answer

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. 
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.

Question 14

Which produces a greater tidal effect in your body,the moon or a 1-kg melon held above your head?

Accepted Answer

A) the moon 
B) the melon 
C) Not enough information is given to make a reasonable estimate. 
A) the moon 
B) the melon 
C) Not enough information is given to make a reasonable estimate.

Question 15

The direction of a gravitational field is

Accepted Answer

A) in the same direction as the 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 the gravitational attraction. 
B) away from the center of gravity of an object. 
C) opposite to the direction of gravitational attraction.

Question 16

An asteroid exerts a 360-N gravitational force on a nearby spacecraft.This force is directed

Accepted Answer

A) toward the asteroid. 
B) away from the asteroid. 
C) toward the sun. 
A) toward the asteroid. 
B) away from the asteroid. 
C) toward the sun.

Question 17

Which pulls on the oceans of the Earth with the greater force?

Accepted Answer

A) the moon 
B) the sun 
C) Both pull the same. 
A) the moon 
B) the sun 
C) Both pull the same.

Question 18

The Earth is currently accelerating toward the sun (centripetal acceleration).If the sun collapsed into a black hole,this acceleration would

Accepted Answer

A) increase. 
B) decrease. 
C) stay the same. 
D) cease to exist. 
A) increase. 
B) decrease. 
C) stay the same. 
D) cease to exist.

Question 19

Suppose the moon had twice the diameter but the same mass and same orbital distance from Earth.In that case,the high tides on Earth would be

Accepted Answer

A) higher. 
B) lower. 
C) unequal in size. 
D) practically the same. 
E) none of these 
A) higher. 
B) lower. 
C) unequal in size. 
D) practically the same. 
E) none of these

Question 20

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

Accepted Answer

A) winter. 
B) spring. 
C) summer. 
D) no particular time because tides do not depend on seasons. 
A) winter. 
B) spring. 
C) summer. 
D) no particular time because tides do not depend on seasons.

Exam 9: Gravity

Half way to the center of a planet of uniform density,your weight compared to that at the surface would be

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

The concept of force is not fundamental to

If the moon were covered with water,tidal effects caused by the Earth would find the moon with

A supplier wants to make a profit by buying metal by weight at one altitude and selling it at the same price per pound at another altitude.The supplier should

No force due to Earth's gravity is acting on the astronauts inside the orbiting space shuttle.This statement is

If a block is set sliding on a huge frictionless plane in contact with the Earth,it will NOT continue to move at constant speed because

The force of gravity acts on all apples on an apple tree.Some apples are twice as far from the ground as others.These twice-as-high apples,for the same mass,have

A very massive object A and a less massive object B move toward each other under the influence of gravitation.Which force,if either,is greater?

The factor most directly responsible for making a black hole invisible is its

The origin of any micro tides in the human body is most likely the

According to Newton,the greater the masses of interacting objects,the

Which produces a greater tidal effect in your body,the moon or a 1-kg melon held above your head?

The direction of a gravitational field is

An asteroid exerts a 360-N gravitational force on a nearby spacecraft.This force is directed

Which pulls on the oceans of the Earth with the greater force?

The Earth is currently accelerating toward the sun (centripetal acceleration).If the sun collapsed into a black hole,this acceleration would

Suppose the moon had twice the diameter but the same mass and same orbital distance from Earth.In that case,the high tides on Earth would be

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

About Science

Newtons First Law of Motion: Inertia

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Atomic Nature of Matter

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