2. A 9 kg box is raised by a crane to a height of 5 m from the ground. From rest it slides down a frictionless incline, 30° from the horizontal. Then it slides on a horizontal floor where a constant frictional force is introduced. The block is brought to rest at point B, which is 20 m to the right of point A. a) What is the work done on the 9 kg block by the crane and by gravity? b) What is the speed of the 9 kg block by the time it reaches point A?
2. A 9 kg box is raised by a crane to a height of 5 m from the ground. From rest it slides down a frictionless incline, 30° from the horizontal. Then it slides on a horizontal floor where a constant frictional force is introduced. The block is brought to rest at point B, which is 20 m to the right of point A. a) What is the work done on the 9 kg block by the crane and by gravity? b) What is the speed of the 9 kg block by the time it reaches point A?
College Physics
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ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:Paul Peter Urone, Roger Hinrichs
Chapter7: Work, Energy, And Energy Resources
Section: Chapter Questions
Problem 8PE: Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 90.0 kg, down a 60.0°...
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2. A 9 kg box is raised by a crane to a height of 5 m from the ground. From rest it slides down a frictionless incline, 30° from the horizontal. Then it slides on a horizontal floor where a constant frictional force is introduced. The block is brought to rest at point B, which is 20 m to the right of point A.
a) What is the work done on the 9 kg block by the crane and by gravity?
b) What is the speed of the 9 kg block by the time it reaches point A?
c) What is the work done by the frictional force on the two blocks as they come to a stop?
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