1.) Suppose that two bicycles have equal overall mass, but one has thin lightwei
ID: 1420458 • Letter: 1
Question
1.) Suppose that two bicycles have equal overall mass, but one has thin lightweight tires while the other has heavier tires made of the same material. Why is the bicycle with thin tires easier to accelerate?
(a) Thin tires have less area of contact with the road.
(b) With thin tires, less mass is distributed at the rims.
(c) With thin tires, you dont have to raise the large mass of the tire at the bottom to the top.
2.) If you turn on a coffee grinding machine sitting on a smooth table top, what do you expect it to do?
(a) Start rotating in the same direction as the blades rotate.
(b) Start rotating in the direction opposite the blade rotation.
(c) Grind the coffee without any rotation of the machine.
3.) The Mississippi River carries sediment from higher latitudes toward the equator. How does this affect the length of the day?
(a) Increases the day.
(b) Decreases the day.
(c) Does not affect the day.
(d) There is no relation between the mass distribution and the length of the day.
Explanation / Answer
1) (a) Thin tires have less area of contact with the road.
2) (b) Start rotating in the direction opposite the blade rotation.
3) (a) Increases the day.
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