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A loaded penguin sled weighing 90 N rests on a plane inclined at 20° to the horizontal. Between the sled and the plane the coefficient of static friction is 0.29, and the coefficient of kinetic friction is 0.19.
a) What is the minimum magnitude of the force F, parallel to the plane, that will prevent the sled from slipping down the plane?
(b) What is the minimum magnitude F that will start the sled moving up the plane?
(c) What value of F is required to move the block up the plane at constant velocity?
1 to work on your car at night you use an extension cord to connect your work light to a power outlet near the door.
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