Question 10

A small sphere of mass M is dropped from a great height. After it has fallen 200 m, it has attained its terminal velocity and is falling at constant speed. The buoyant force is negligible. Which of the following statements is true?

(a)   After it has fallen 200 m, there is no net force acting on the sphere
(b)   After it has fallen 200 m, no further net work is done on the sphere
(c)   The temperature of the sphere increases during the flight
(d)   There is a nonzero net force acting on the sphere throughout its entire flight

• A.    All are true
• B.    (a) and (b)
• C.    (d) only
• D.    (a) only
• E.    (c) only
• F.    (a), (b), and (c)
• G.    None is true

Formula Sheet

Question 9

Question 11

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