Question 1

A ball is thrown horizontally from the top of a tall cliff.Three seconds later,the ball has fallen a vertical distance of

Accepted Answer

A)  20 m.
B)  30 m.
C)  45 m.
D)  depends on the initial horizontal speed of the ball

Question 2

A satellite in an elliptical orbit travels at constant

Accepted Answer

A)  velocity.
B)  speed.
C)  acceleration.
D)  all the above
E)  none of the above

Question 3

A softball player determines her pitching speed by throwing a ball horizontally from an elevation of 20 m above the ground.The ball lands 50 m downrange.What is her pitching speed?

Accepted Answer

A)  5 m/s
B)  10 m/s
C)  20 m/s
D)  25 m/s
E)  none of the above

Question 4

The planet Jupiter takes a longer time to travel around the Sun than Earth because Jupiter

Accepted Answer

A)  has farther to go.
B)  goes slower.
C)  both of these
D)  none of the above

Question 5

An object is placed exactly halfway between the Earth and the Moon.The object will fall toward the

Accepted Answer

A)  Earth.
B)  Moon.
C)  neither

Question 6

The Moon does not crash into Earth because

Accepted Answer

A)  Earth's gravitational field is weak at the Moon's distance.
B)  the gravitational pull of other planets keeps the Moon up.
C)  the Moon has a sufficient tangential speed.
D)  the Moon has less mass than Earth.
E)  none of the above

Question 7

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

Accepted Answer

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

Question 8

If the Sun were twice as massive,

Accepted Answer

A)  its pull on the Earth would double.
B)  Earth's pull on the Sun would double.
C)  both of these
D)  none of the above

Question 9

Planets wobble in their orbits due to

Accepted Answer

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

Question 10

What is the force of gravity on a 500-N woman standing on Earth's surface?

Accepted Answer

A)  50 N
B)  250 N
C)  500 N
D)  598 N
E)  5000 N

Question 11

Traveling from Earth to the Moon requires that a rocket have

Accepted Answer

A)  less than escape speed from Earth.
B)  more than escape speed from Earth.
C)  any sustained speed if time isn't a factor.

Question 12

An Earth satellite in an elliptical orbit travels slowest when it is

Accepted Answer

A)  nearest the Earth.
B)  farthest from the Earth.
C)  neither of these

Question 13

Communications and weather satellites always appear at the same place in the sky because these satellites are

Accepted Answer

A)  beyond the pull of Earth's gravitational field.
B)  moving at a speed just short of escape velocity.
C)  orbiting Earth with a 24-hour period.
D)  stationary in space.
E)  none of the above

Question 14

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 s later?

Accepted Answer

A)  50 m
B)  98 m
C)  100 m
D)  500 m
E)  none of the above

Question 15

The planet Jupiter is about 300 times as massive as Earth,yet on its surface you would weigh only about 3 times as much 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 Earth's radius.
D)  you are 100 times more weightless there.
E)  none of the above

Question 16

A softball player determines her pitching speed by throwing a ball horizontally from an elevation of 5 m above the ground.The ball lands 20 m downrange.What is her pitching speed?

Accepted Answer

A)  5 m/s
B)  10 m/s
C)  20 m/s
D)  25 m/s
E)  none of the above

Question 17

Perturbations of planets are due to

Accepted Answer

A)  interplanetary forces.
B)  deviations from straight-line paths.
C)  uneven masses of planets.
D)  none of the above

Question 18

If the radius of the Earth somehow increased with no change in mass,your weight would

Accepted Answer

A)  increase.
B)  not change.
C)  decrease.

Question 19

Wobbles in the path of Uranus led to the discovery of

Accepted Answer

A)  Jupiter.
B)  Mars.
C)  Neptune.
D)  all of the above
E)  none of the above

Question 20

If there were no gravity,a ball thrown upward at an angle would follow a straight-line path.Due to gravity,however,at the end of 2 s it is

Accepted Answer

A)  5 m below the straight line.
B)  10 m below the straight line.
C)  15 m below the straight line.
D)  20 m below the straight line.
E)  more than 20 m below the straight line.

Exam 4: Gravity, Projectiles, and Satellites

Planets wobble in their orbits due to

Correct AnswerverifiedShow Answer

An object is placed exactly halfway between the Earth and the Moon.The object will fall toward the

Correct AnswerverifiedShow Answer

A ball is thrown horizontally from the top of a tall cliff.Three seconds later,the ball has fallen a vertical distance of

Correct AnswerverifiedShow Answer

The Moon does not crash into Earth because

Correct AnswerverifiedShow Answer

A softball player determines her pitching speed by throwing a ball horizontally from an elevation of 5 m above the ground.The ball lands 20 m downrange.What is her pitching speed?

Correct AnswerverifiedShow Answer

Wobbles in the path of Uranus led to the discovery of

Correct AnswerverifiedShow Answer

The planet Jupiter takes a longer time to travel around the Sun than Earth because Jupiter

Correct AnswerverifiedShow Answer

The planet Jupiter is about 300 times as massive as Earth,yet on its surface you would weigh only about 3 times as much because

Correct AnswerverifiedShow Answer

An Earth satellite in an elliptical orbit travels slowest when it is

Correct AnswerverifiedShow Answer

Perturbations of planets are due to

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Communications and weather satellites always appear at the same place in the sky because these satellites are

Correct AnswerverifiedShow Answer

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 s later?

Correct AnswerverifiedShow Answer

If the radius of the Earth somehow increased with no change in mass,your weight would

Correct AnswerverifiedShow Answer

What is the force of gravity on a 500-N woman standing on Earth's surface?

Correct AnswerverifiedShow Answer

A satellite in an elliptical orbit travels at constant

Correct AnswerverifiedShow Answer

A softball player determines her pitching speed by throwing a ball horizontally from an elevation of 20 m above the ground.The ball lands 50 m downrange.What is her pitching speed?

Correct AnswerverifiedShow Answer

If the Sun were twice as massive,

Correct AnswerverifiedShow Answer

Traveling from Earth to the Moon requires that a rocket have

Correct AnswerverifiedShow Answer

If there were no gravity,a ball thrown upward at an angle would follow a straight-line path.Due to gravity,however,at the end of 2 s it is

Correct AnswerverifiedShow Answer

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