Question 1

A projectile is launched at an angle of 15° above the horizontal and lands downrange. With no air resistance, what other projection angle for the same speed would produce the same downrange distance?

Accepted Answer

A)  30°
B)  45°
C)  50°
D)  75°
E)  90°F) B) and D)
G) None of the above

Question 2

Ignoring air drag, what is the maximum speed that can be given to a horizontally moving tennis ball as it clears the net 1.25 m high to remain within the edge of the court, which is 12.0 m distant?

Accepted Answer

A)  12.0 m/s
B)  16.0 m/s
C)  24.0 m/s
D)  48.0 m/sE) A) and D)
F) A) and C)

Question 3

The fastest moving planet in a solar system is

Accepted Answer

A)  the smallest planet.
B)  the most massive planet.
C)  the planet nearest the Sun.
D)  the planet farthest from the Sun.
E)  any planet, for they all move at the same speed.F) B) and C)
G) A) and B)

Question 4

Strictly speaking, when you step off a curb you are momentarily

Accepted Answer

A)  in orbit.
B)  weightless.
C)  in space.D) All of the above
E) A) and C)

Question 5

The International Space Station orbits at an average 360-km altitude so that it is mainly above Earth's

Accepted Answer

A)  atmosphere.
B)  gravitation.
C)  bothD) B) and C)
E) A) and C)

Question 6

A hunter aims a rifle at an angle of 10° above the horizontal. The hunter fires a bullet while simultaneously dropping another bullet from the side of the rifle. Which bullet hits the ground first?

Accepted Answer

A)  the dropped one
B)  the fired one
C)  both hit at the same timeD) B) and C)
E) A) and B)

Question 7

How is stepping off a curb similar to taking a ride aboard the space shuttle?

Accepted Answer

In both instances you experience weightl...

Question 8

Minimal orbit speed about Earth is about 8 km/s. Minimal orbital speed about the Moon would be

Accepted Answer

A)  less than 8 km/s.
B)  more than 8 km/s.
C)  about 8 km/s.D) A) and B)
E) A) and C)

Question 9

An object is thrown vertically into the air. Because of air resistance, the time for its descent will be

Accepted Answer

A)  longer than the ascent time.
B)  shorter than the ascent time.
C)  equal to the ascent time.
D)  not enough informationE) A) and B)
F) A) and C)

Question 10

In the vacuum of outer space, there is no

Accepted Answer

A)  gravity.
B)  atmospheric pressure.
C)  bothD) All of the above
E) A) and C)

Question 11

Two projectiles are fired at equal speeds but different angles. One is fired at an angle of 30° and the other at 60°. With no air resistance, the projectile to hit the ground first will be the one fired at

Accepted Answer

A)  30°.
B)  60°.
C)  both hit at the same timeD) A) and B)
E) A) and C)

Question 12

The Sun is spherical due to

Accepted Answer

A)  Earth circling it.
B)  Earth and Moon circling it.
C)  gravitation.
D)  none of the aboveE) B) and D)
F) B) and C)

Question 13

Neglecting air resistance, after a ball leaves your hand when you toss it upward, the force on it

Accepted Answer

A)  gradually decreases until the ball reaches the top of its path.
B)  first acts upward and then downward after reaching the top.
C)  s only the force due to gravity, always directed downward.
D)  none of the aboveE) A) and B)
F) A) and C)

Question 14

A supplier wants to make a profit by buying gold by weight at one altitude and selling it at the same price per kilogram 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.D) None of the above
E) All of the above

Question 15

An Earth satellite is in an elliptical orbit. The satellite travels fastest when it is

Accepted Answer

A)  nearest the Earth.
B)  farthest from the Earth.
C)  neitherD) A) and C)
E) B) and C)

Question 16

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.D) None of the above
E) All of the above

Question 17

According to Newton, the closer gravitationally interacting objects are to each other, the

Accepted Answer

A)  less the gravitational force between them.
B)  more the gravitational force between them.
C)  constancy of the force between them.D) A) and B)
E) A) and C)

Question 18

When the distance between two stars doubles, the force between them

Accepted Answer

A)  decreases by one-quarter.
B)  decreases by one-half.
C)  increases to twice as much.
D)  increases to four times as much.
E)  remains the same.F) B) and E)
G) A) and B)

Question 19

An Earth satellite is simply a projectile freely falling around the Earth.

Accepted Answer

A)  true
B)  false
C)  sometimes true and sometimes falseD) B) and C)
E) A) and C)

Question 20

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
D)  neitherE) B) and C)
F) None of the above

Exam 4: Gravity, Projectiles, and Satellites

If the Sun were twice as massive,

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An Earth satellite is simply a projectile freely falling around the Earth.

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

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An object is thrown vertically into the air. Because of air resistance, the time for its descent will be

Correct AnswerverifiedShow Answer

According to Newton, the closer gravitationally interacting objects are to each other, the

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The Sun is spherical due to

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When the distance between two stars doubles, the force between them

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

The International Space Station orbits at an average 360-km altitude so that it is mainly above Earth's

Correct AnswerverifiedShow Answer

Ignoring air drag, what is the maximum speed that can be given to a horizontally moving tennis ball as it clears the net 1.25 m high to remain within the edge of the court, which is 12.0 m distant?

Correct AnswerverifiedShow Answer

In the vacuum of outer space, there is no

Correct AnswerverifiedShow Answer

How is stepping off a curb similar to taking a ride aboard the space shuttle?

Correct AnswerverifiedIn both instances you experience weightl...View AnswerShow Answer

Neglecting air resistance, after a ball leaves your hand when you toss it upward, the force on it

Correct AnswerverifiedShow Answer

Minimal orbit speed about Earth is about 8 km/s. Minimal orbital speed about the Moon would be

Correct AnswerverifiedShow Answer

The fastest moving planet in a solar system is

Correct AnswerverifiedShow Answer

Strictly speaking, when you step off a curb you are momentarily

Correct AnswerverifiedShow Answer

A hunter aims a rifle at an angle of 10° above the horizontal. The hunter fires a bullet while simultaneously dropping another bullet from the side of the rifle. Which bullet hits the ground first?

Correct AnswerverifiedShow Answer

An Earth satellite is in an elliptical orbit. The satellite travels fastest when it is

Correct AnswerverifiedShow Answer

Two projectiles are fired at equal speeds but different angles. One is fired at an angle of 30° and the other at 60°. With no air resistance, the projectile to hit the ground first will be the one fired at

Correct AnswerverifiedShow Answer

A projectile is launched at an angle of 15° above the horizontal and lands downrange. With no air resistance, what other projection angle for the same speed would produce the same downrange distance?

Correct AnswerverifiedShow Answer

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In both instances you experience weightl...
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