Question 1

Astronauts in the space shuttle feel weightless because

Accepted Answer

A)  They are so far away from the center of the Earth. 
B)  they are in a constant state of free - fall. 
C)  they are moving very rapidly. 
D)  there is no atmosphere where they are. 
A)  They are so far away from the center of the Earth. 
B)  they are in a constant state of free - fall. 
C)  they are moving very rapidly. 
D)  there is no atmosphere where they are.

Question 2

A three - wheeler is

Accepted Answer

A)  statically stable and dynamically unstable 
B)  statically unstable and dynamically stable 
C)  both statically and dynamically unstable 
D)  both statically and dynamically stable 
A)  statically stable and dynamically unstable 
B)  statically unstable and dynamically stable 
C)  both statically and dynamically unstable 
D)  both statically and dynamically stable

Question 3

The rest energy of a 60 kg person is

Accepted Answer

A)  8.4x1018 J 
B)  5.4x1018 J 
C)  1.8x1010 J 
D)  9x1016 J 
A)  8.4x1018 J 
B)  5.4x1018 J 
C)  1.8x1010 J 
D)  9x1016 J

Question 4

You can make a bicycle lean by

Accepted Answer

A)  briefly steering it in the direction of a turn 
B)  briefly steering it in the direction opposite the turn 
C)  Braking 
D)  Pedaling faster 
A)  briefly steering it in the direction of a turn 
B)  briefly steering it in the direction opposite the turn 
C)  Braking 
D)  Pedaling faster

Question 5

Astronauts in a space shuttle accelerating uniformly in a straight line far away from any planet or star would

Accepted Answer

A)  feel weightless. 
B)  feel just like there is local gravity 
C)  feel like they are moving very rapidly. 
D)  feel nothing 
A)  feel weightless. 
B)  feel just like there is local gravity 
C)  feel like they are moving very rapidly. 
D)  feel nothing

Question 6

When moving, a bicycle is in a state of dynamic equilibrium due to

Accepted Answer

A)  gyroscopic effects 
B)  air resistance 
C)  the shape of the fork 
D)  (
A)  and (
C)  
A)  gyroscopic effects 
B)  air resistance 
C)  the shape of the fork 
D)  (
A)  and (
C)

Question 7

Escape velocity at the surface of the Earth is about

Accepted Answer

A)  250 mph 
B)  11,200 mph 
C)  25,000 mph 
D)  250,000 mph 
A)  250 mph 
B)  11,200 mph 
C)  25,000 mph 
D)  250,000 mph

Question 8

All current rockets eject stages or booster rockets as they climb from the earth's surface up to orbit. A rocket that did not eject any stages or booster rockets while climbing from the ground to orbit would

Accepted Answer

A)  experience too much drag while in orbit and would be unable to remain in orbit for more than a day or two. 
B)  not have anything beneath the rocket on which to push and would be unable to propel itself upward after it left the launch pad area. 
C)  clutter the space around the earth with orbiting debris. 
D)  have to have a launch weight that was about 90% rocket fuel. 
A)  experience too much drag while in orbit and would be unable to remain in orbit for more than a day or two. 
B)  not have anything beneath the rocket on which to push and would be unable to propel itself upward after it left the launch pad area. 
C)  clutter the space around the earth with orbiting debris. 
D)  have to have a launch weight that was about 90% rocket fuel.

Question 9

Comets have very eccentric orbits around the sun. Please explain why it is that they spend so little time near the earth.

Accepted Answer

The orbits of comets are usually very la

Question 10

It is important for cyclists to lean their bicycles while negotiating sharp turns because

Accepted Answer

A)  the torque created by their leaning balances out the frictional torque from the road which would tend to flip them. 
B)  the torque created by their leaning balances out their weight and holds them up. 
C)  their tires flatten out, thus getting better traction on the road. 
D)  they increase their static stability 
A)  the torque created by their leaning balances out the frictional torque from the road which would tend to flip them. 
B)  the torque created by their leaning balances out their weight and holds them up. 
C)  their tires flatten out, thus getting better traction on the road. 
D)  they increase their static stability

Question 11

The Earth is about 81 times as massive as the Moon. Suppose the earth and Moon are 240,000 miles apart. If you were an astronaut between the Earth and Moon at what distance from the Earth will the gravitational attraction on you from the two bodies be equal and opposite?

Accepted Answer

A)  216,000 mi 
B)  2963 mi 
C)  24,000 km 
D)  24,000 miles 
A)  216,000 mi 
B)  2963 mi 
C)  24,000 km 
D)  24,000 miles

Question 12

Suppose your instructor staggers into class the morning after an all-night excellence in classroom humor workshop. He proceeds to do a demonstration in class where he measures a 6.67 N gravitational force of repulsion between two particles each having a mass of 1 kg and separated by 1m. Moreover he cuts the distance to 0.1 of what it originally was and then claims the force changes to a new value of 0.667 N. Specific to the scientific content of his demonstration please briefly describe three important concepts he incorrectly illustrated (there's more than three, trust me). One of your three points must be quantitative - involving a force calculation of some sort.

Accepted Answer

1. Gravity is attractive - not repulsive

Question 13

What mass has a rest energy of 100J?

Accepted Answer

A)  1.1x10-15 kg 
B)  3x10-8 kg 
C)  3.3x10-7 kg 
D)  0.01 kg 
A)  1.1x10-15 kg 
B)  3x10-8 kg 
C)  3.3x10-7 kg 
D)  0.01 kg

Question 14

The maximum speed a rocket can achieve is

Accepted Answer

A)  the speed of light 
B)  the speed of sound. 
C)  equal to the speed of its exhaust plume. 
D)  less than the speed of its exhaust plume. 
E)  greater than the speed of its exhaust plume but less than the speed of light. 
A)  the speed of light 
B)  the speed of sound. 
C)  equal to the speed of its exhaust plume. 
D)  less than the speed of its exhaust plume. 
E)  greater than the speed of its exhaust plume but less than the speed of light.

Question 15

You go to a quick - fix garage to get your brakes worked on. When your tires are re - installed, the mechanic forgets to put the lug nuts on your tires. Although nobody gets hurt, a tire comes off your car when you are traveling fairly rapidly and it is able to roll through a very large distance, even hitting bumps and objects in the way. Please explain why the tire can roll so far without tipping over.

Accepted Answer

Just like a rolling coin, a car tire is

Question 16

You and a friend are on roller skates. You are in a room and have a basketball and are standing in between two parallel walls. By touching only the ball, describe how you would make yourselves come together.

Accepted Answer

You can stand sideways so you won't roll

Question 17

A top is

Accepted Answer

A)  Statically stable and dynamically unstable. 
B)  Statically unstable and dynamically stable. 
C)  Statically unstable and dynamically unstable. 
D)  Statically stable and dynamically stable. 
A)  Statically stable and dynamically unstable. 
B)  Statically unstable and dynamically stable. 
C)  Statically unstable and dynamically unstable. 
D)  Statically stable and dynamically stable.

Question 18

Rockets receive their forward propulsion through

Accepted Answer

A)  pushing against the ground and objects in space 
B)  mass conservation of the rocket and fuel 
C)  pushing against the exhaust 
D)  small aerodynamic forces 
A)  pushing against the ground and objects in space 
B)  mass conservation of the rocket and fuel 
C)  pushing against the exhaust 
D)  small aerodynamic forces

Question 19

You buy an older motorcycle and notice that, even in low gear, it is difficult to get the bike going. You should replace the sprocket in the rear wheel with one that is

Accepted Answer

A)  smaller so the motor can do more work at the start 
B)  smaller so the motor won't have to do so much work at the start. 
C)  larger so the motor won't have to do so much work at the start. 
D)  larger so the motor can do more work at the start. 
A)  smaller so the motor can do more work at the start 
B)  smaller so the motor won't have to do so much work at the start. 
C)  larger so the motor won't have to do so much work at the start. 
D)  larger so the motor can do more work at the start.

Question 20

How far apart would two 100 kg persons need to be so that the force they exert on each other is equal to 1N? You can assume they are point masses, having mass but no size.

Accepted Answer

A)  1m 
B)  6.672x10-7 m 
C)  8.17x10-4 m 
D)  100 m 
A)  1m 
B)  6.672x10-7 m 
C)  8.17x10-4 m 
D)  100 m

Astronauts in the space shuttle feel weightless because

A three - wheeler is

The rest energy of a 60 kg person is

You can make a bicycle lean by

Astronauts in a space shuttle accelerating uniformly in a straight line far away from any planet or star would

When moving, a bicycle is in a state of dynamic equilibrium due to

Escape velocity at the surface of the Earth is about

All current rockets eject stages or booster rockets as they climb from the earth's surface up to orbit. A rocket that did not eject any stages or booster rockets while climbing from the ground to orbit would

Comets have very eccentric orbits around the sun. Please explain why it is that they spend so little time near the earth.

It is important for cyclists to lean their bicycles while negotiating sharp turns because

The Earth is about 81 times as massive as the Moon. Suppose the earth and Moon are 240,000 miles apart. If you were an astronaut between the Earth and Moon at what distance from the Earth will the gravitational attraction on you from the two bodies be equal and opposite?

What mass has a rest energy of 100J?

The maximum speed a rocket can achieve is

You and a friend are on roller skates. You are in a room and have a basketball and are standing in between two parallel walls. By touching only the ball, describe how you would make yourselves come together.

A top is

Rockets receive their forward propulsion through

You buy an older motorcycle and notice that, even in low gear, it is difficult to get the bike going. You should replace the sprocket in the rear wheel with one that is

How far apart would two 100 kg persons need to be so that the force they exert on each other is equal to 1N? You can assume they are point masses, having mass but no size.

The Laws of Motion, Part 1

The Laws of Motion, Part 2

Mechanical Objects, Part 1

Fluids

Fluids and Motion

Heat and Phase Transitions

Thermodynamics

Resonance and Mechanical Waves

Electricity

Magnetism and Electrodynamics

Electromagnetic Waves

Light

Optics and Electronics

Modern Physics

Filters

Exam 4: Mechanical Objects, Part 2

Astronauts in the space shuttle feel weightless because

A three - wheeler is

The rest energy of a 60 kg person is

You can make a bicycle lean by

Astronauts in a space shuttle accelerating uniformly in a straight line far away from any planet or star would

When moving, a bicycle is in a state of dynamic equilibrium due to

Escape velocity at the surface of the Earth is about

All current rockets eject stages or booster rockets as they climb from the earth's surface up to orbit. A rocket that did not eject any stages or booster rockets while climbing from the ground to orbit would

Comets have very eccentric orbits around the sun. Please explain why it is that they spend so little time near the earth.

It is important for cyclists to lean their bicycles while negotiating sharp turns because

The Earth is about 81 times as massive as the Moon. Suppose the earth and Moon are 240,000 miles apart. If you were an astronaut between the Earth and Moon at what distance from the Earth will the gravitational attraction on you from the two bodies be equal and opposite?

What mass has a rest energy of 100J?

The maximum speed a rocket can achieve is

You and a friend are on roller skates. You are in a room and have a basketball and are standing in between two parallel walls. By touching only the ball, describe how you would make yourselves come together.

A top is

Rockets receive their forward propulsion through

You buy an older motorcycle and notice that, even in low gear, it is difficult to get the bike going. You should replace the sprocket in the rear wheel with one that is

How far apart would two 100 kg persons need to be so that the force they exert on each other is equal to 1N? You can assume they are point masses, having mass but no size.

The Laws of Motion, Part 1

The Laws of Motion, Part 2

Mechanical Objects, Part 1

Fluids

Fluids and Motion

Heat and Phase Transitions

Thermodynamics

Resonance and Mechanical Waves

Electricity

Magnetism and Electrodynamics

Electromagnetic Waves

Light

Optics and Electronics

Modern Physics

Filters