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Anettt [7]
3 years ago
6

A 10,000 N piano is dropped from the top of a building. When the piano reaches terminal speed…

Physics
1 answer:
wel3 years ago
7 0

a). When the piano reaches terminal speed, it is no longer accelerating,
so the net force on it must be <em>zero</em>.

b). If the net force on the piano is zero, the upward force of air resistance on it
must be exactly equal to the downward force of gravity ... <em>10,000 N</em>.


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After 15 seconds, the green car will catch up with the blue car

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Let the time for the green car to catch up with the blue car be T

When the green car catches up to the blue car, the distances covered by each car after time T will be equal. Also, their velocities at that instant will be equal

Distance covered by blue car after time T is given by: s = ut + 0.5 at²

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Where v = 0.2T, t = T - 7.5 (since the blue car started 7.5 seconds earlier)

S = 0.2T (T - 7.5)

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Explanation:

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