P2207_fall10_lecture15

# P2207_fall10_lecture15 - applied at an angle of 10 with...

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Today: Work and Energy: Work done by a single force Work-kinetic energy theorem Work done by gravity, friction…
A ball of mass m is swung at the end of the rope in a horizontal circle . Its speed v is constant and the length of the rope is L . What work W is done by the tension T in the rope when the mass moves a small distance s along the circle? L s v W = ? A. mg s B. T s C. T L D. 0

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10 kg F pull =10 N 10 10 m A 10 kg crate is pulled 10 m along a frictionless horizontal floor by a force F pull =10 N

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Unformatted text preview: applied at an angle of 10 with respect to the horizontal, as shown. What is the net work done on the crate by all the forces that act on it? W net = ? A. 100 cos 10 J B. 100 sin 10 J C. 1000 J+ 100 sin 10 J D. 1000 J+ 100 sin 10 J A car of mass m traveling at a speed v is braked to a stop by a constant force F . What is the stopping distance d of the car? (Use energy/work concepts to solve, not NII.) d = ? A. F/v B. mv/F C. mv 2 /2F D. mv 2 /F E. 2F/mv 2...
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## This note was uploaded on 10/27/2010 for the course PHYS 2207 at Cornell.

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P2207_fall10_lecture15 - applied at an angle of 10 with...

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