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pychu [463]
2 years ago
11

I would appreciate some help.

Physics
1 answer:
motikmotik2 years ago
4 0
You oughtta be able to do this one.

The "efficiency" is just the portion of the input work that
comes out in a useful form.

If the efficiency is 70%, that tells you that however much work
you put INto the machine, the machine will do 70% of that much
work for you at the output side.

Put 20,000 J in ... out comes (0.70) x (20,000 J)  =  14,000 J .

What happens to the other 30% of the work you put into it ?
It turns into HEAT.  That's why machines always have to be
cooled somehow while they're running.  
 
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espero haberte ayudado :)

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1 year ago
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A skier of mass 70 kg is pulled up a slope by a motor-driven cable. The acceleration of gravity is 9.8 m/s 2 . How much work is
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4 0
3 years ago
Junior slides across home plate during a baseball game. If he has a mass of 115 kg, and the coefficient of kinetic friction betw
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But you can compute in a straightway:

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= 115 x 9.81 x 0.35

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= 395 N

 

It will still give the same results.

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