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Mice21 [21]
3 years ago
13

What does the power of a machine measure?

Physics
2 answers:
GarryVolchara [31]3 years ago
5 0

The power of a machine is the work/time ratio for that particular machine

Its the rate of doing work.

bixtya [17]3 years ago
4 0
The power of a machine is the work/time ratio for that particular machine.



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A 27 kg bear slides, from rest, 14 m down a lodgepole pine tree, moving with a speed of 6.1 m/s just before hitting the ground.
Nadusha1986 [10]
<h2>Thus the force of friction is 235 N</h2>

Explanation:

When the bear was at the height of 14 m . Its potential energy = m g h

here m is the mass of bear , g is acceleration due to gravity and h is the height .

Thus P.E =  27 x 10 x 14 = 3780 J

The K.E of the bear just before hitting = \frac{1}{2} m v²

=   \frac{1}{2} x 27 x ( 6.1 )²  = 490 J

The force of friction f = P.E - K.E = 3290 J

Because the work done = Force x Distance

Thus frictional force = \frac{3290}{14} = 235 N

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