Question 1

What would be the weight of a 59.1-kg astronaut on a planet with the same density as Earth and having twice Earth's radius?

Accepted Answer

A) 580 N 
B) 290 N 
C) 1160 N 
D) 2320 N 
E) 1200 N 
A) 580 N 
B) 290 N 
C) 1160 N 
D) 2320 N 
E) 1200 N

Question 2

An object weighs 432 N on the surface of the earth.The earth has radius R.If the object is raised to a height of 3R above the earth's surface,what is its weight?

Accepted Answer

A) 108 N 
B) 48.0 N 
C) 27.0 N 
D) 305 N 
E) 144 N 
A) 108 N 
B) 48.0 N 
C) 27.0 N 
D) 305 N 
E) 144 N

Question 3

Europa,a satellite of Jupiter,has an orbital diameter of 1.34 × 109 m and a period of 3.55 days.What is the mass of Jupiter? (G = 6.67 × 10-11 N ∙ m2/kg2)

Accepted Answer

A) 1.53 × 1027 kg 
B) 1.65 × 1027 kg 
C) 1.07 × 1027 kg 
D) 1.89 × 1027 kg 
E) 3.08 × 1027 kg 
A) 1.53 × 1027 kg 
B) 1.65 × 1027 kg 
C) 1.07 × 1027 kg 
D) 1.89 × 1027 kg 
E) 3.08 × 1027 kg

Question 4

Two small objects,with masses m and M,are originally a distance r apart,and the gravitational force on each one has magnitude F.The second object has its mass changed to 2M,and the distance is changed to r/4.What is the magnitude of the new gravitational force?

Accepted Answer

A) F/32 
B) F/16 
C) 16F 
D) 32F 
E) 2F 
A) F/32 
B) F/16 
C) 16F 
D) 32F 
E) 2F

Question 5

Mithra is an unknown planet that has two airless moons,A and B,in circular orbits around it.The table summarizes the hypothetical data about these moons.If you dropped a laser at the surface of Moon B,at what rate would it accelerate toward the ground? (G = 6.67 × 10-11 N ∙ m2/kg2)

Accepted Answer

A) 0.10 m/s2 
B) 0.15 m/s2 
C) 0.20 m/s2 
D) 0.25 m/s2 
E) 0.30 m/s2 
A) 0.10 m/s2 
B) 0.15 m/s2 
C) 0.20 m/s2 
D) 0.25 m/s2 
E) 0.30 m/s2

Question 6

The acceleration due to gravity on Planet A is one-sixth what it is on Planet B,and the radius of the Planet A is one-fourth that of Planet B.The mass of Planet A is what fraction of the mass of Planet B?

Accepted Answer

A) 1/6 
B) 1/16 
C) 1/24 
D) 1/96 
E) 1/12 
A) 1/6 
B) 1/16 
C) 1/24 
D) 1/96 
E) 1/12

Question 7

Three identical 50-kg balls are held at the corners of an equilateral triangle,30 cm on each side.If one of the balls is released,what is the magnitude of its initial acceleration if the only forces acting on it are the gravitational forces due to the other two masses? (G = 6.67 × 10-11 N ∙ m2/kg2)

Accepted Answer

A) 3.7 × 10-8 m/s2 
B) 2.5 × 10-8 m/s2 
C) 1.9 × 10-8 m/s2 
D) 4.2 × 10-8 m/s2 
E) 6.4 × 10-8 m/s2 
A) 3.7 × 10-8 m/s2 
B) 2.5 × 10-8 m/s2 
C) 1.9 × 10-8 m/s2 
D) 4.2 × 10-8 m/s2 
E) 6.4 × 10-8 m/s2

Question 8

What would be the weight of a 59.1-kg astronaut on a planet twice as massive as Earth and having twice Earth's radius?

Accepted Answer

A) 580 N 
B) 290 N 
C) 1160 N 
D) 118 N 
E) 1200 N 
A) 580 N 
B) 290 N 
C) 1160 N 
D) 118 N 
E) 1200 N

Question 9

If you stood on a planet having a mass four times that of Earth's mass,and a radius two times that of Earth's radius,you would weigh

Accepted Answer

A) the same as you do on Earth. 
B) two times more than you do on Earth. 
C) two times less than you do on Earth. 
D) four times more than you do on Earth. 
A) the same as you do on Earth. 
B) two times more than you do on Earth. 
C) two times less than you do on Earth. 
D) four times more than you do on Earth.

Question 10

The innermost satellite of Jupiter orbits the planet with a radius of 422 × 103 km and a period of 1.77 days.What is the mass of Jupiter? (G = 6.67 × 10-11 N ∙ m2/kg2)

Accepted Answer

A) 1.33 × 1027 kg 
B) 1.50 × 1027 kg 
C) 1.72 × 1027 kg 
D) 1.89 × 1027 kg 
E) 3.08 × 1027 kg 
A) 1.33 × 1027 kg 
B) 1.50 × 1027 kg 
C) 1.72 × 1027 kg 
D) 1.89 × 1027 kg 
E) 3.08 × 1027 kg

Question 11

At a given point above Earth's surface,the acceleration due to gravity is equal to  
What is the altitude of this point above Earth's surface? (G = 6.67 × 10-11 N ∙ m2/kg2,Mearth = 5.97 × 1024 kg,Rearth = 6.38 × 106 m)

Accepted Answer

A) 770 km 
B) 970 km 
C) 1,500 km 
D) 2,000 km 
E) 2,400 km 
A) 770 km 
B) 970 km 
C) 1,500 km 
D) 2,000 km 
E) 2,400 km

Question 12

The mass of the Moon is 7.4 × 1022 kg,its radius is 1.74 × 103 km,and it has no atmosphere.What is the acceleration due to gravity at the surface of the Moon? (G = 6.67 × 10-11 N ∙ m2/kg2)

Accepted Answer

A) 2.8 × 106 m/s2 
B) 9.8 m/s2 
C) 4.9 m/s2 
D) 1.6 m/s2 
E) 0.80 m/s2 
A) 2.8 × 106 m/s2 
B) 9.8 m/s2 
C) 4.9 m/s2 
D) 1.6 m/s2 
E) 0.80 m/s2

Question 13

Suppose NASA wants a satellite to revolve around Earth 5 times a day.What should be the radius of its orbit if we neglect the presence of the Moon? (G = 6.67 × 10-11 N ∙ m2/kg2,Mearth = 5.97 × 1024 kg)

Accepted Answer

A) 1.44 × 107 m 
B) 0.69 × 107 m 
C) 7.22 × 107 m 
D) 2.11 × 107 m 
A) 1.44 × 107 m 
B) 0.69 × 107 m 
C) 7.22 × 107 m 
D) 2.11 × 107 m

Exam 12: Gravity

What would be the weight of a 59.1-kg astronaut on a planet with the same density as Earth and having twice Earth's radius?

An object weighs 432 N on the surface of the earth.The earth has radius R.If the object is raised to a height of 3R above the earth's surface,what is its weight?

Europa,a satellite of Jupiter,has an orbital diameter of 1.34 × 109 m and a period of 3.55 days.What is the mass of Jupiter? (G = 6.67 × 10-11 N ∙ m2/kg2)

Two small objects,with masses m and M,are originally a distance r apart,and the gravitational force on each one has magnitude F.The second object has its mass changed to 2M,and the distance is changed to r/4.What is the magnitude of the new gravitational force?

Mithra is an unknown planet that has two airless moons,A and B,in circular orbits around it.The table summarizes the hypothetical data about these moons.If you dropped a laser at the surface of Moon B,at what rate would it accelerate toward the ground? (G = 6.67 × 10-11 N ∙ m2/kg2)

The acceleration due to gravity on Planet A is one-sixth what it is on Planet B,and the radius of the Planet A is one-fourth that of Planet B.The mass of Planet A is what fraction of the mass of Planet B?

What would be the weight of a 59.1-kg astronaut on a planet twice as massive as Earth and having twice Earth's radius?

If you stood on a planet having a mass four times that of Earth's mass,and a radius two times that of Earth's radius,you would weigh

The innermost satellite of Jupiter orbits the planet with a radius of 422 × 103 km and a period of 1.77 days.What is the mass of Jupiter? (G = 6.67 × 10-11 N ∙ m2/kg2)

At a given point above Earth's surface,the acceleration due to gravity is equal to What is the altitude of this point above Earth's surface? (G = 6.67 × 10-11 N ∙ m2/kg2,Mearth = 5.97 × 1024 kg,Rearth = 6.38 × 106 m)

The mass of the Moon is 7.4 × 1022 kg,its radius is 1.74 × 103 km,and it has no atmosphere.What is the acceleration due to gravity at the surface of the Moon? (G = 6.67 × 10-11 N ∙ m2/kg2)

Suppose NASA wants a satellite to revolve around Earth 5 times a day.What should be the radius of its orbit if we neglect the presence of the Moon? (G = 6.67 × 10-11 N ∙ m2/kg2,Mearth = 5.97 × 1024 kg)

Introduction to Physics

One-Dimensional Kinematics

Vectors in Physics

Two-Dimensional Kinematics

Newtons Laws of Motion

Applications of Newtons Laws

Work and Kinetic Energy

Potential Energy and Conservation of Energy

Linear Momentum and Collisions

Rotational Kinematics and Energy

Rotational Dynamics and Static Equilibrium

Oscillations About Equilibrium

Waves and Sound

Fluids

Temperature and Heat

Phases and Phase Changes

The Laws of Thermodynamics

Electric Charges, Forces, and Fields

Electric Potential and Electric

Electric Current and Direct-Current Circuits

Magnetism

Magnetic Flux and Faradays Law of Induction

Alternating-Current Circuits

Electromagnetic Waves

Geometrical Optics

Optical Instruments

Physical Optics: Interference and Diffraction

Relativity

Quantum Physics

Atomic Physics

Nuclear Physics and Nuclear Radiation

Filters

Europa,a satellite of Jupiter,has an orbital diameter of 1.34 × 10⁹ m and a period of 3.55 days.What is the mass of Jupiter? (G = 6.67 × 10^-11 N ∙ m²/kg²)

Mithra is an unknown planet that has two airless moons,A and B,in circular orbits around it.The table summarizes the hypothetical data about these moons.If you dropped a laser at the surface of Moon B,at what rate would it accelerate toward the ground? (G = 6.67 × 10^-11 N ∙ m²/kg²)

The innermost satellite of Jupiter orbits the planet with a radius of 422 × 10³ km and a period of 1.77 days.What is the mass of Jupiter? (G = 6.67 × 10^-11 N ∙ m²/kg²)

At a given point above Earth's surface,the acceleration due to gravity is equal to What is the altitude of this point above Earth's surface? (G = 6.67 × 10^-11 N ∙ m²/kg²,M_earth = 5.97 × 10²⁴ kg,R_earth = 6.38 × 10⁶ m)

The mass of the Moon is 7.4 × 10²² kg,its radius is 1.74 × 10³ km,and it has no atmosphere.What is the acceleration due to gravity at the surface of the Moon? (G = 6.67 × 10^-11 N ∙ m²/kg²)

Suppose NASA wants a satellite to revolve around Earth 5 times a day.What should be the radius of its orbit if we neglect the presence of the Moon? (G = 6.67 × 10^-11 N ∙ m²/kg²,M_earth = 5.97 × 10²⁴ kg)