A wheel of diameter 0.70 m rolls on the floor without slipping. A point at the t

Question

A wheel of diameter 0.70 m rolls on the floor without slipping. A point at the top of the wheel moves with a speed 2.0 m/s relative to the floor.

(a) At what speed is the central axis of the wheel moving relative to the floor?
(b) What is the angular speed of the wheel?

When a car is weighed, it is driven slowly on a horizontal floor over a scale that records a reading as the front wheels go over the scale, and then records a second reading as the rear wheels go over the scale. The weight of the car is equal to:

A) the average of the two weights

B) the weight under the rear wheels

C) the weight under the front wheels

D) the sum of the two weights

E) the difference of the two weights

Explanation / Answer

When a car is weighed, it is allowed to move over a scale which records a reading as the front wheels go
over the scale, and a second reading when the rear wheels go over the scale. The weight of the car is equal
to

D) the sum of the two weights.
Answer: D

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