14. whitney is about to go skiing down a hill with her friends. she
changes her velocity from 0 m/s to 18 m/s in 9 seconds. what is
whitney's acceleration in that 9 seconds? formula: a = vf - vilt
oa.
9 m/s?
18 m/s?
2 m/s2
5 m/s2
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Amerry-go-round of radius r, shown in the figure, is rotating at constant angular speed. the friction in its bearings is so small that it can be ignored. a sandbag of mass m is dropped onto the merry-go-round, at a position designated by r. the sandbag does not slip or roll upon contact with the merry-go-round. how would you rank the following different combinations of m and r on the basis of the angular speed of the merry-go-round after the sandbag "sticks" to the merry-go-round from largest to smallest. a) m = 10kg, r = 0.25r b) m = 20kg, r = 0.25r c) m = 10kg, r = 0.50r d) m = 10kg, r = 1.0r e) m = 15kg, r = 0.75r f) m = 40kg, r = 0.25r