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1. Compute the mechanical work done by the helicopter on lifting a 1,200-kg house to a height...

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Physics

1. Compute the mechanical work done by the helicopter on liftinga 1,200-kg house to a

height of 800m. Show all your work.

2. What maximum speed (in miles per hour) can a 1,800-kg,160-horse-power car theoretically develop moving up a 30-degreeslope? Show all your work.

3. A boat of mass 720kg (including passengers) floats stationaryon water before an 80-kg woman jumps into it horizontally at 5m/s.At what speed does the boat begin to move? Show all your work.

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