AP Physics C 2017

(Marvins-Underground-K-12) #1
(a) Determine   the magnitude   and direction   of  the vertical    component   of  the bomb’s  velocity    at  the point
of release.
(b) Determine the magnitude and direction of the horizontal component of the bomb’s velocity at the
point when the bomb contacts the target.
(c) Determine how much time it takes for the bomb to hit the target after it is released.
(d) At the point of release, what angle below the horizontal does the pilot have to look in order to see
the target?

Solutions to Practice Problems


1 . Call “up” the positive direction, and set up a chart. We know that v (^) f = 0 because, at its maximum
height, the firework stops for an instant.
Solve for Δx using equation *: . The answer is (C) 125 m, or about skyscraper
height.
2 . Call “down” positive, and set up a chart:
Plug straight into
(Δx = v 0 t + ^1 / 2 at 2 ) and you have the answer. This is NOT a quadratic,

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