Quiz 2 - Quiz 2 1 Swimming at 1.00 m/s relative to still...

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Quiz 2 1 . Swimming at 1.00 m/s relative to still water, a swimmer heads directly across a river of width 105 m. He arrives 20 m downstream from the point directly across the river from his starting point. (a) What is the speed of the current in the river? __________ m/s 2 . (b) At what angle relative to the line perpendicular to the shore should he head to arrive at a point directly opposite his starting point? __________ o 3 . An arrow has an initial launch speed of 26 m/s. If it must strike a target 30 m away at the same elevation, what should be the projection angle? __________ o 4 . A child slides down a slide with a 21 o incline, and at the bottom her speed is precisely two-thirds what it would have been if the slide had been frictionless. Calculate the coefficient of kinetic friction between the slide and the child. __________ 5 . A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.62 of the person's regular weight.

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• Spring '11
• rollino

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