Boat Rope

How much work does the rope do on the skier?

A boat with a horizontal tow rope pulls a water skier. She skis off to the side, so the rope makes an angle of 12.0 with the forward direction of motion.
If the tension in the rope is 200N , how much work does the rope do on the skier during a forward displacement of 340m ?

Look at the three distances.
340 m traveled
the upward distance caused by the 12 degree movement
the actual path of the skier between the two
Force over a distance is work
so your 200N is forward and up, the result of two smaller forces at 90 degrees.
so calculate the up distance
use that, to subtract that potion of the force from the 200N

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admin posted at 2012-9-9 Category: Boat Parts