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3 years ago

A mechanic uses a mechanical lift to raise a car. The car weighs 11,000 N. The lift raises the car 2.5 m.

Physics

2 answers:

ruslelena [56]3 years ago

7 0

The car gains Ep=mass*g*difference_in_height=11000*2.5=27500 J

Answer A

KengaRu [80]3 years ago

5 0

Potential energy = (weight) x (height)

After the car has been raised 2.5 meters, it has

(11,000) x (2.5) = 27,500 Joules

MORE potential energy than it had before it was lifted.

That's the energy that has to come from the work you do to lift it.

Since no mechanical process is ever 100% efficient, the work required
to accomplish this task is <em>at least 27,500 joules</em>.

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