Question 1

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

Accepted Answer

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

Question 2

If the Earth had twice its present radius and twice its present mass, what would happen to your weight? Explain.

Accepted Answer

If only the radius of the Eart

Question 3

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 
A) atmosphere. 
B) gravitational influence. 
C) both

Question 4

Shoot a cannonball horizontally from a cannon at the top of a mountain and it gains speed as it falls and hits the ground below. But fire the cannonball fast enough for circular orbit and no change in speed occurs. Why?

Accepted Answer

The cannonball that hits the ground has

Question 5

A satellite near Earth makes a full circle in about 90 minutes. How long would a satellite located as far away as the Moon take to orbit Earth?

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 6

A "weightless" astronaut in an orbiting space vehicle is

Accepted Answer

A) shielded from Earth's gravitational effects. 
B) beyond the pull of gravity. 
C) without a support force. 
D) all of the above 
E) none of the above 
A) shielded from Earth's gravitational effects. 
B) beyond the pull of gravity. 
C) without a support force. 
D) all of the above 
E) none of the above

Question 7

A hunter fires a bullet from a horizontally-held rifle 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 time 
A) the dropped one 
B) the fired one 
C) both hit at the same time

Question 8

Tangential velocity is velocity

Accepted Answer

A) parallel to the surface of the Earth. 
B) perpendicular to the surface of the Earth. 
C) attributed to satellites moving in any direction. 
A) parallel to the surface of the Earth. 
B) perpendicular to the surface of the Earth. 
C) attributed to satellites moving in any direction.

Question 9

A projectile is fired vertically from the surface of the Earth at 8 km/s and remains in a vertical path. The projectile will

Accepted Answer

A) go into circular motion about Earth. 
B) rise and fall back to Earth's surface. 
C) follow an uncertain path. 
A) go into circular motion about Earth. 
B) rise and fall back to Earth's surface. 
C) follow an uncertain path.

Question 10

A woman who normally weighs 400 N stands on top of a very tall ladder so she is one Earth-radius above Earth's surface. What is her weigh there?

Accepted Answer

A) zero 
B) 100 N 
C) 200 N 
D) 400 N 
E) none of the above 
A) zero 
B) 100 N 
C) 200 N 
D) 400 N 
E) none of the above

Question 11

If your mass remains unchanged while both the mass of Earth and its radius doubles, your weight

Accepted Answer

A) remains the same. 
B) doubles. 
C) quadruples. 
D) increases by eight times. 
E) reduces by half. 
A) remains the same. 
B) doubles. 
C) quadruples. 
D) increases by eight times. 
E) reduces by half.

Question 12

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

Accepted Answer

A) increase also. 
B) decrease. 
C) remain the same. 
A) increase also. 
B) decrease. 
C) remain the same.

Question 13

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

Question 14

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

Question 15

How far must one travel to completely be beyond Earth's gravity?

Accepted Answer

A) to a region above the Earth's atmosphere 
B) to a region well beyond the Moon 
C) to a region beyond the solar system 
D) forget it; you can't travel far enough 
A) to a region above the Earth's atmosphere 
B) to a region well beyond the Moon 
C) to a region beyond the solar system 
D) forget it; you can't travel far enough

Question 16

If the masses of two planets doubles and the distance between them also doubles, the force between them would be

Accepted Answer

A) one-quarter. 
B) half as much. 
C) twice as much. 
D) four times as much. 
E) none of the above 
A) one-quarter. 
B) half as much. 
C) twice as much. 
D) four times as much. 
E) none of the above

Question 17

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 
A) Earth. 
B) Moon. 
C) neither

Question 18

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

Question 19

Consider a monkey wrench released at rest at the far edge of the solar system. Suppose that it drops to Earth by virtue of only Earth's gravity. The wrench will strike Earth's surface with a speed of about

Accepted Answer

A) 10 m/s. 
B) 8 km/s. 
C) 11 km/s. 
D) the speed of light. 
A) 10 m/s. 
B) 8 km/s. 
C) 11 km/s. 
D) the speed of light.

Question 20

What prevents satellites such as the space shuttle from falling?

Accepted Answer

A) gravity 
B) centripetal force 
C) centrifugal force 
D) the absence of air resistance 
E) nothing, they continually fall around and around Earth 
A) gravity 
B) centripetal force 
C) centrifugal force 
D) the absence of air resistance 
E) nothing, they continually fall around and around Earth

Exam 4: Gravity, Projectiles, and Satellites

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

If the Earth had twice its present radius and twice its present mass, what would happen to your weight? Explain.

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

Shoot a cannonball horizontally from a cannon at the top of a mountain and it gains speed as it falls and hits the ground below. But fire the cannonball fast enough for circular orbit and no change in speed occurs. Why?

A satellite near Earth makes a full circle in about 90 minutes. How long would a satellite located as far away as the Moon take to orbit Earth?

A "weightless" astronaut in an orbiting space vehicle is

A hunter fires a bullet from a horizontally-held rifle while simultaneously dropping another bullet from the side of the rifle. Which bullet hits the ground first?

Tangential velocity is velocity

A projectile is fired vertically from the surface of the Earth at 8 km/s and remains in a vertical path. The projectile will

A woman who normally weighs 400 N stands on top of a very tall ladder so she is one Earth-radius above Earth's surface. What is her weigh there?

If your mass remains unchanged while both the mass of Earth and its radius doubles, your weight

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

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

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

How far must one travel to completely be beyond Earth's gravity?

If the masses of two planets doubles and the distance between them also doubles, the force between them would be

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

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

Consider a monkey wrench released at rest at the far edge of the solar system. Suppose that it drops to Earth by virtue of only Earth's gravity. The wrench will strike Earth's surface with a speed of about

What prevents satellites such as the space shuttle from falling?

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 Timereading 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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