Question 1

A projectile that is fired vertically at 5 km/s from the Earth's surface will

Accepted Answer

A)  go into a circular orbit about Earth.
B)  go into an elliptical orbit about Earth.
C)  rise and fall back to Earth's surface.
D)  none of the aboveE) None of the above
F) All of the above

Question 2

A rock is thrown upward at 50° with respect to the horizontal.As it rises,its horizontal component of velocity

Accepted Answer

A)  increases.
B)  remains unchanged.
C)  decreases.D) All of the above
E) B) and C)

Question 3

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)  both of these
D)  none of the aboveE) B) and C)
F) A) and D)

Question 4

If a projectile is fired straight up at a speed of 10 m/s,neglecting air resistance,the total time to return to its starting position is

Accepted Answer

A)  1 s.
B)  2 s.
C)  10 s.
D)  20 s.
E)  not enough informationF) A) and E)
G) B) and D)

Question 5

A projectile that is fired vertically at 8 km/s from Earth's surface will

Accepted Answer

A)  go into circular orbit about Earth.
B)  rise and fall back to Earth's surface.
C)  follow an uncertain path.
D)  escape from Earth.E) A) and B)
F) B) and C)

Question 6

Escape speed from Earth is

Accepted Answer

A)  8 km/s.
B)  9.8 km/s.
C)  11.2 km/s.
D)  42.2 km/s.E) B) and D)
F) C) and D)

Question 7

For the astronauts inside an orbiting space vehicle the force of gravity that acts on them is

Accepted Answer

A)  zero.
B)  mainly due to Earth below.
C)  mainly due to the mass of the space vehicle.
D)  mainly due to nearby planets and stars.
E)  none of the aboveF) B) and C)
G) A) and C)

Question 8

An Earth satellite is simply a projectile

Accepted Answer

A)  freely falling around Earth.
B)  floating motionless in space near Earth.
C)  approaching Earth from outer space.D) A) and C)
E) A) and B)

Question 9

Earth satellites are typically more than 100-km high so as to mainly be above the Earth's

Accepted Answer

A)  atmosphere.
B)  gravitational influence.
C)  both of these
D)  none of the aboveE) B) and C)
F) A) and C)

Question 10

Phil stands at rest with both feet on a scale that reads 500 N.After he gently lifts one foot,the scale reads

Accepted Answer

A)  less than 500 N.
B)  500 N.
C)  more than 500 N.D) All of the above
E) B) and C)

Question 11

A bullet fired horizontally hits the ground in 0.5 s.If it had been fired with twice the velocity it would have hit the ground in

Accepted Answer

A)  less than 0.5 s.
B)  more than 0.5 s.
C)  0.5 s.D) A) and B)
E) All of the above

Question 12

Two objects move toward each other due to gravity.As the objects get closer and closer,the force between them

Accepted Answer

A)  increases.
B)  decreases.
C)  remains constant.D) None of the above
E) All of the above

Question 13

With no air resistance a projectile fired horizontally maintains its horizontal component of velocity because

Accepted Answer

A)  no forces act on it.
B)  no horizontal forces act on it.
C)  of no initial vertical component of velocity.
D)  all of the above
E)  none of the aboveF) A) and D)
G) C) and E)

Question 14

With no air resistance,a projectile fired at 60° has the same range as if it were fired at

Accepted Answer

A)  15°.
B)  30°.
C)  45°.
D)  75°.E) A) and B)
F) A) and C)

Question 15

The force of gravity on a bowling ball rolling along a horizontal surface doesn't change its speed because the force is

Accepted Answer

A)  small compared to the ball's weight.
B)  canceled by the normal force.
C)  perpendicular to its direction of motion.
D)  canceled by friction.E) None of the above
F) A) and B)

Question 16

A satellite near Earth makes a full circle in about 90 minutes.Much farther from Earth,say at the distance to the Moon,time for a full circle would be

Accepted Answer

A)  90 minutes.
B)  less than 90 minutes.
C)  about 28 days.
D)  not enough information
E)  none of the aboveF) D) and E)
G) A) and D)

Question 17

Minimal orbit speed about Earth is about 8 km/s.Minimal orbital speed for a satellite about Jupiter would be

Accepted Answer

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

Question 18

Toss a rock at an angle into the air and it follows a curved path.Its velocity at any instant can be resolved into horizontal and vertical components.Which of these components changes with time,and why?

Accepted Answer

Only the vertical component changes with...

Question 19

A vertically oriented rocket that is able to sustain a continuous upward velocity of 8 km/s will

Accepted Answer

A)  eventually escape from Earth.
B)  be unable to escape Earth.
C)  maintain a fixed orbit around Earth.D) All of the above
E) B) and C)

Question 20

An airplane flies at 40 m/s at an altitude of 50 m.The pilot drops a heavy package that falls to the ground below.Neglecting air resistance,the package will land

Accepted Answer

A)  beneath the plane.
B)  400 m behind the plane.
C)  500 m behind the plane.
D)  more than 500 m behind the plane.
E)  none of the aboveF) A) and C)
G) All of the above

Exam 4: Gravity, Projectiles, and Satellites

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

Correct AnswerverifiedShow Answer

A projectile that is fired vertically at 8 km/s from Earth's surface will

Correct AnswerverifiedShow Answer

Phil stands at rest with both feet on a scale that reads 500 N.After he gently lifts one foot,the scale reads

Correct AnswerverifiedShow Answer

Toss a rock at an angle into the air and it follows a curved path.Its velocity at any instant can be resolved into horizontal and vertical components.Which of these components changes with time,and why?

Correct AnswerverifiedOnly the vertical component changes with...View AnswerShow Answer

Two objects move toward each other due to gravity.As the objects get closer and closer,the force between them

Correct AnswerverifiedShow Answer

An Earth satellite is simply a projectile

Correct AnswerverifiedShow Answer

With no air resistance a projectile fired horizontally maintains its horizontal component of velocity because

Correct AnswerverifiedShow Answer

A vertically oriented rocket that is able to sustain a continuous upward velocity of 8 km/s will

Correct AnswerverifiedShow Answer

The force of gravity on a bowling ball rolling along a horizontal surface doesn't change its speed because the force is

Correct AnswerverifiedShow Answer

A satellite near Earth makes a full circle in about 90 minutes.Much farther from Earth,say at the distance to the Moon,time for a full circle would be

Correct AnswerverifiedShow Answer

A bullet fired horizontally hits the ground in 0.5 s.If it had been fired with twice the velocity it would have hit the ground in

Correct AnswerverifiedShow Answer

Escape speed from Earth is

Correct AnswerverifiedShow Answer

A projectile that is fired vertically at 5 km/s from the Earth's surface will

Correct AnswerverifiedShow Answer

Minimal orbit speed about Earth is about 8 km/s.Minimal orbital speed for a satellite about Jupiter would be

Correct AnswerverifiedShow Answer

A rock is thrown upward at 50° with respect to the horizontal.As it rises,its horizontal component of velocity

Correct AnswerverifiedShow Answer

Earth satellites are typically more than 100-km high so as to mainly be above the Earth's

Correct AnswerverifiedShow Answer

If a projectile is fired straight up at a speed of 10 m/s,neglecting air resistance,the total time to return to its starting position is

Correct AnswerverifiedShow Answer

For the astronauts inside an orbiting space vehicle the force of gravity that acts on them is

Correct AnswerverifiedShow Answer

With no air resistance,a projectile fired at 60° has the same range as if it were fired at

Correct AnswerverifiedShow Answer

An airplane flies at 40 m/s at an altitude of 50 m.The pilot drops a heavy package that falls to the ground below.Neglecting air resistance,the package will land

Correct AnswerverifiedShow Answer

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Only the vertical component changes with...
View Answer

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