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30 April, 19:00

A boat weighing 9.0 * 102 newtons requires a horizontal force of 6.0 * 102 newtons to move it across the water at 1.5 * 101 meters per second. The boat's engine must provide energy at the rate of

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  1. 30 April, 19:21
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    - - The boat's engine is providing 600 newtons of force.

    - - Every second, the force pushes on the boat for 15 meters.

    - - So during that second, the engine does (15 x 600) = 9,000 J of work.

    - - The rate at which the engine provides energy to move the boat is

    9,000 joules per second = 9,000 watts.

    - - (The energy comes from chemical energy

    stored in the gas that the engine burns.)
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