Question 1

You discover a moon orbiting a planet.The moon has an orbital period of 3 weeks,and the average distance between the moon and planet is  .What is the planet's mass? Compare its mass to that of Jupiter,which is  .

Accepted Answer

The answer of You discover a moon orbiting a planet.The...

Question 2

If you travel 20 miles from home to school in 30 minutes,what is your average velocity?

Accepted Answer

A)  20 mph 
B)  40 mph 
C)  0.7 mph 
D)  5 mph

Question 3

The Hubble Space Telescope orbits at an altitude of 600 km above the Earth's surface.Assuming it is in a stable circular orbit,what is its velocity? For reference,the Earth's radius is 6,400 km,and Earth's mass is  .

Accepted Answer

A)  240,000 m/s 
B)  7,500 m/s 
C)  51,000 m/s 
D)  You must know the mass of the Hubble Space Telescope to determine its speed.

Question 4

What is the velocity one would need to give a satellite in order for it to escape from the solar system (meaning the Sun)if it was launched from the Earth at a distance of 1 AU from the Sun? Give your answer in units of m/s.

Accepted Answer

The answer of What is the velocity one would need...

Question 5

Who of the following was NOT a proponent of the heliocentric model of the solar system?

Accepted Answer

A)  Galileo 
B)  Copernicus 
C)  Newton 
D)  Ptolemy

Question 6

What is your acceleration if you go from 0 to 60 mph in 4 seconds?

Accepted Answer

A)  60 mph/s 
B)  30 mph/s 
C)  15 mph/s 
D)  8.5 mph/s

Question 7

If we wanted to increase the Hubble Space Telescope's altitude above the Earth and keep it in a stable orbit,we also would need to

Accepted Answer

A)  increase its orbital speed. 
B)  increase its weight. 
C)  decrease its weight. 
D)  decrease its orbital speed.

Question 8

Explain the difference between being weightless and being in free fall.

Accepted Answer

The answer of Explain the difference between being weightless and...

Question 9

In a spaceship orbiting Earth,two astronauts want to measure the mass of a mouse.How can they easily do it if they are in constant free fall?

Accepted Answer

A)  Place the mouse on a spring-loaded scale and weigh it. 
B)  Measure the gravitational attraction between the mouse and a steel ball of known mass. 
C)  Drop the mouse from the top of the shuttle to its bottom. 
D)  Push on the mouse with a known force and measure its acceleration.

Question 10

As we move farther from the Sun,the circumferences of planetary orbits are larger and the speeds at which planets travel increase.

Accepted Answer

A) True 
 B)False

Question 11

What acceleration would result from a 5-N force acting on a 3-kg object? (A Newton [N] has units of kg  . )

Accepted Answer

The answer of What acceleration would result from a 5-N...

Question 12

Planets orbit the Sun on circular orbits.

Accepted Answer

A) True 
 B)False

Question 13

What information would you need to obtain about one of the moons of the planet Jupiter in order to measure the mass of Jupiter?

Accepted Answer

The answer of What information would you need to obtain...

Question 14

The only acceleration you experience on a merry-go-round is when it starts or stops.

Accepted Answer

A) True 
 B)False

Question 15

In the absence of air friction,a 0.001-kg piece of paper and a 0.1-kg notebook are dropped from the same height and allowed to fall to the ground.How do their accelerations compare?

Accepted Answer

A)  The accelerations are the same. 
B)  The notebook's acceleration is 100 times faster than the paper's acceleration. 
C)  The notebook's acceleration is 1,000 times faster than the paper's acceleration. 
D)  The paper's acceleration is 100 times faster than the notebook's acceleration.

Question 16

An astronaut orbiting the Earth in a circular orbit at a constant speed does not feel the force of gravity because his/her acceleration is zero.

Accepted Answer

A) True 
 B)False

Question 17

The natural tendency of an object to resist changes in motion is called

Accepted Answer

A)  inertia. 
B)  weight. 
C)  acceleration. 
D)  mass.

Question 18

A planet travels fastest when it is closest to the Sun.

Accepted Answer

A) True 
 B)False

Question 19

You apply a force of 10 N to a grocery cart in order to get an acceleration of  .If you apply a force of 20 N to the same grocery cart,its acceleration will be

Accepted Answer

A)   . 
B)   . 
C)   . 
D)   .

Question 20

A kilogram of lead has more mass than a kilogram of feathers.

Accepted Answer

A) True 
 B)False

Exam 3: Gravity and Orbitsa Celestial Ballet

You discover a moon orbiting a planet.The moon has an orbital period of 3 weeks,and the average distance between the moon and planet is .What is the planet's mass? Compare its mass to that of Jupiter,which is .

If you travel 20 miles from home to school in 30 minutes,what is your average velocity?

The Hubble Space Telescope orbits at an altitude of 600 km above the Earth's surface.Assuming it is in a stable circular orbit,what is its velocity? For reference,the Earth's radius is 6,400 km,and Earth's mass is .

What is the velocity one would need to give a satellite in order for it to escape from the solar system (meaning the Sun)if it was launched from the Earth at a distance of 1 AU from the Sun? Give your answer in units of m/s.

Who of the following was NOT a proponent of the heliocentric model of the solar system?

What is your acceleration if you go from 0 to 60 mph in 4 seconds?

If we wanted to increase the Hubble Space Telescope's altitude above the Earth and keep it in a stable orbit,we also would need to

Explain the difference between being weightless and being in free fall.

In a spaceship orbiting Earth,two astronauts want to measure the mass of a mouse.How can they easily do it if they are in constant free fall?

As we move farther from the Sun,the circumferences of planetary orbits are larger and the speeds at which planets travel increase.

What acceleration would result from a 5-N force acting on a 3-kg object? (A Newton [N] has units of kg . )

Planets orbit the Sun on circular orbits.

What information would you need to obtain about one of the moons of the planet Jupiter in order to measure the mass of Jupiter?

The only acceleration you experience on a merry-go-round is when it starts or stops.

In the absence of air friction,a 0.001-kg piece of paper and a 0.1-kg notebook are dropped from the same height and allowed to fall to the ground.How do their accelerations compare?

An astronaut orbiting the Earth in a circular orbit at a constant speed does not feel the force of gravity because his/her acceleration is zero.

The natural tendency of an object to resist changes in motion is called

A planet travels fastest when it is closest to the Sun.

You apply a force of 10 N to a grocery cart in order to get an acceleration of .If you apply a force of 20 N to the same grocery cart,its acceleration will be

A kilogram of lead has more mass than a kilogram of feathers.