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Force, work & energy

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1) The motor of a ski boat generates an average power of 35900 W when the boat is moving at a constant speed of 17.7 m/s. When the boat is pulling a skier at the same speed, the engine must generate an average power of 80700 W. What is the tension in the tow rope that is pulling the skier?

2) The drawing shows the force-versus-displacement graph for two different bows. These graphs give the force that an archer must apply to draw the bowstring. Estimate the additional work required for bow 1 compared to bow 2.

3)

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The expert examines a work, force and energy. A step by step solution provided.

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Average power when only boat is moving at 17.7 m/s = 35900 W

Average power when boat is pulling the skier at 17.7 m/s = 80700 W

Average power generated when only boat is moving = Resistance force of water x Velocity of boat = FR x ...

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