# Test_3 - Physics 211 Test#3 fall 2007 1(a A force Name F...

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Physics 211 Test #3 fall 2007 Name:_________________________ 1.  (a)  A force  k N j N i N F ˆ ) 4 ( ˆ ) 0 . 3 ( ˆ ) 0 . 2 ( - - = acts on an object that moves in a straight line through a  displacement  k m j m i m d ˆ ) 0 . 2 ( ˆ ) 0 . 5 ( ˆ ) 0 . 3 ( - + = .  What work does the force do on the object during this  displacement? (b)  A boy pulls a wagon along a horizontal path.  The force with which he pulls has a magnitude of 24 N and it is  directed at an angle of 25 o  above the horizontal.  How much work does the pulling force do as the wagon moves  through a distance of 25 meters? (c)  A sky diver with her parachute fully deployed is falling vertically at a steady speed. The diver-parachute system  has a total mass of 75 kilograms What work is done by the drag force on the diver-parachute system during a descent of 1500  meters? If the sky diver’s steady speed is 2.5 m/s, what power is being developed by the drag force?

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