Bubba hitches his tractorto a sled loaded with pine cones and pulls it in a stra

Question

Bubba hitches his tractorto a sled loaded with pine cones and pulls it in a straight line adistance of 20.0 m along a level frozen ground. The total weight ofthe sled and pine cones is 14,700 N. The tractor exerts aconstant force at an angle of 36.9 degrees above thehorizontal. If the coefficient of kinetic friction is 0.480and the sled and cargo is moving at a constantvelocity, what is the work done by the tractor inmoving the sled and cargo a distance of 20.0m? I have done this problem over and over and keep coming up with141120 J as my answer, but that isn't one of my possible choices.What am I doing wrong? Bubba hitches his tractorto a sled loaded with pine cones and pulls it in a straight line adistance of 20.0 m along a level frozen ground. The total weight ofthe sled and pine cones is 14,700 N. The tractor exerts aconstant force at an angle of 36.9 degrees above thehorizontal. If the coefficient of kinetic friction is 0.480and the sled and cargo is moving at a constantvelocity, what is the work done by the tractor inmoving the sled and cargo a distance of 20.0m? I have done this problem over and over and keep coming up with141120 J as my answer, but that isn't one of my possible choices.What am I doing wrong?

Explanation / Answer

total weight W = 14700 N angle = 36.9 degrees the coefficient of kinetic friction = 0.480 distance S = 20 m It move with constant velocity ,So, applied force inhorizontal direction = frcitional force         F cos =[ W- F sin ]       0.799 F = 0.48 [ 14700- 0.6 F]                   = 7056 - 0.2882 F                F = 6490 N work done W = F S                       =129801.32 J

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