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ryzh [129]
3 years ago
13

A 200.0 kg piano is elevated by a crane to a height of 10.0 meters above a sidewalk. If the rope holding the piano breaks, what

will the potential energy of the piano be when it has fallen 5.00 meters?
a) 0 J
b) 9,810 J
c) 10,000 J
d) 19,620 J
Physics
1 answer:
Nitella [24]3 years ago
5 0
All that business about the crane and the rope and the falling
is only there to confuse us.

The piano ended up 5 meters above the ground.

           Potential energy = (mass) (gravity) (height)

                                   = (200 kg) (9.81 m/s²) (5 m)

                                   = (200 · 9.81 · 5)  (kg-m²/s²)

                                   =   9,810 joules   . 
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3 years ago
Suppose you push a hockey puck of mass m across frictionless ice for a time \Delta t, starting from rest, giving thepuck speed v
bazaltina [42]

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1. t_2 = 2t_1

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In Newton's 2nd law: F = ma

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t = v / a_1

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t = \frac{v}{2a_2}

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2. The distance traveled by the puck is as the following equation:

d = at^2

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7 0
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The 5 points are certainly appreciated, but I do wish they were Celsius points.


3 0
3 years ago
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