Question 1

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. 
A) increases. 
B) decreases. 
C) remains constant.

Question 2

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

Question 3

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 information 
A) 1 s. 
B) 2 s. 
C) 10 s. 
D) 20 s. 
E) not enough information

Question 4

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. 
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.

Question 5

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

Question 6

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. 
A) less than 500 N. 
B) 500 N. 
C) more than 500 N.

Question 7

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

Question 8

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 above 
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 above

Question 9

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 above 
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 above

Question 10

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 above 
A) atmosphere. 
B) gravitation. 
C) both of these 
D) none of the above

Question 11

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. 
A) eventually escape from Earth. 
B) be unable to escape Earth. 
C) maintain a fixed orbit around Earth.

Question 12

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 13

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°. 
A) 15°. 
B) 30°. 
C) 45°. 
D) 75°.

Question 14

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 above 
A) atmosphere. 
B) gravitational influence. 
C) both of these 
D) none of the above

Question 15

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

Question 16

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. 
A) less than 0.5 s. 
B) more than 0.5 s. 
C) 0.5 s.

Question 17

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. 
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.

Question 18

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 above 
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 above

Question 19

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. 
A) increases. 
B) remains unchanged. 
C) decreases.

Question 20

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 above 
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 above

Exam 4: Gravity, Projectiles, and Satellites

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

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

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

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

An Earth satellite is simply a projectile

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

Escape speed from Earth is

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

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

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

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

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?

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

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

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

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

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

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

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

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

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Time - Reading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: The Nature of Science

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