Mr. King's Chapter 10 Physics Test
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- 1.Which has greater linear speed, a horse near the outside rail of a merry-go round or a horse near the inside rail?
- A.
The inside horse
- B.
The outside horse
- C.
Neither-- they both have the same linear speed
- 2.Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
- A.
Neither-- they both have the same angular speed
- B.
The inside horse
- C.
The outside horse
- 3.What is the direction of the force that acts on clothes in the spin cycle of a washing machine?
- A.
Inward
- B.
Down
- C.
Outward
- D.
Up
- 4.A tin can whirled on the end of a string moves in a circle because
- A.
The can continually pulls on the string
- B.
Once the can starts moving, that is its natural tendency
- C.
There is a force on the can pulling it outward
- D.
There is an inward force acting on the can
- E.
All of the above
- 5.If you whirl a tin can on the end of a string and the string suddenly breaks, the can will
- A.
Fly directly away from you
- B.
Fly off, tangent to its circular path
- C.
Fly directly toward you
- D.
Spiral in toward your hand
- E.
Spiral away from your hand
- 6.A lady bug rests on the bottom of a tin can that is being whirled horizontally on the end of a string. Since the ladybug, like the can, moves in a circle, there must be a force on it. What exerts this force?
- A.
Gravity
- B.
The string
- C.
There is no force acting on it
- D.
The can
- E.
Your hand
- 7.People in the future may well live inside a rotating space structure that is more than 2 km in diameter. Inside the structure, people on the inside of the outer edge will experience 1 g while people halfway to the axis will experience
- A.
2 g
- B.
1 g
- C.
1/2 g
- D.
1/4 g
- E.
0 g
- 8."Centrifugal forces" are an apparent reality to observers in a reference frame that is
- A.
Rotating
- B.
An inertial reference frame
- C.
Moving at constant velocity
- D.
At rest
- E.
None of the above
- 9.As the rotational speed of a space habitat increases, the weight of people inside
- A.
Decreases
- B.
Increases
- C.
Stays the same
- 10.A car travels in a circle with constant speed. The net force on the car
- A.
Is zero because the car is not accelerating
- B.
Is directed forward, in the direction of travel
- C.
Is directed toward the center of the curve
- D.
None of the above
- 11.If Earth rotated more slowly about its axis, your weight would
- A.
Decrease
- B.
Increase
- C.
Stay the same
- 12.A possible space habitat of the future is a cylinder in space rotating about its long axis. What is the relative gravitational field along the axis of the habitat?
- A.
1/4 g
- B.
1/2 g
- C.
3/4 g
- D.
G
- E.
Zero
- 13.When a railroad train rounds a banded track, the centripetal force needed comes not from friction, but from the
- A.
Vertical component of the normal force
- B.
Horizontal component of the normal force
- C.
Normal force
- D.
None of the above
- 14.The centripetal force exerted on stunt motorcyclist Biker Bob while riding on the inner vertical surface of a circular track is
- A.
Triction
- B.
His weight
- C.
The normal force
- D.
None of the above
- 15.Nellie Newton swings a rock into a circular path while holding an attached string overhead. The string makes a 45-degree angle to the vertical (compromising a "conical pendulum") the centripetal force that holds the rock in its circular path is the
- A.
Vertical component of the string tension
- B.
Horizontal component of the string tension
- C.
Tension in the string
- D.
None of the above
- 16.Stunt motorcyclist Biker Bob rides his bike inside a futuristic rotating space station- a giant rotating doughnuts- shaped structure in space. The normal support force feels like weight to him. As he rides his bike in the same direction that the station rotates, the normal force
- A.
Remains unaffected
- B.
Increases
- C.
Decreases
- 17.Stunt motorcyclist Biker Bob rides his bike inside a futuristic rotating space station-- a giant rotating doughnut-shaped structure in space. The normal support force feels like weight to him. As he rides his bike in the opposite direction to the station's rotation, the normal force
- A.
Remains unaffected
- B.
Increases
- C.
Decreases
- 18.A space habitat is designed so that the variation in g between a perso's head and feet is less than 0.01 g. If the person is 2 m tall, the the radius of the habitat is
- A.
20 m
- B.
200 m
- C.
2000 m
- D.
More than 2000 m
- 19.A game room in a rotating space habitat is located in a 0.25 g region. If a person can jump 0.5 m high in a 1 g region, how high can the same person jump in the game room
- A.
0.5 m
- B.
2 m
- C.
4 m
- D.
8 m
- E.
More than 8 m
- 20.Earth rotates and revolves through space. Earth rotates about the ___, which is an ___ axis. Earth revolves about the ___, which is an ___ axis.
- A.
Sun, external, North/South pole, internal
- B.
North/South pole, external, sun, internal
- C.
Sun, internal, North/South pole, external
- D.
North/South pole, internal, sun, external
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