P2207_fall10_lecture8 - r / T = inward acceleration of...

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Today: • Uniform circular motion • Forces – Newton’s laws of motion
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An object of mass m moves in a circle of radius r at constant speed v . What is the inward acceleration of the particle a in terms of m , r and v ? Use dimensional analysis , i.e. a m r v A. a = rv B. a mv 2 /r C. a = mv 2 /r D. a v 2 /r E. a = v 2 /r
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Analysis of a Salad Spinner diameter of basket d = 2r = basket revolutions/crank turn = crank turns/second during operation= Period of rotation = 1 / (crank turns revs/turn) = speed of basket rim v = 2
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Unformatted text preview: r / T = inward acceleration of object on the rim a = v 2 /r = Divide by g=10 m/s 2 to get accelerations in g's: a = Force F Overhead views of a block that lies on a frictionless floor are shown below. If the force magnitudes are chosen properly, in which situations is it possible that the block is either stationary or moving with constant velocity? F 1 (1) (3) (4) (2) F 1 F 1 F 2 F 2 F 3 F 1 F 2 F 3 F 2 A. (2) and (3) B. (2) and (4) C. (2), (3), and (4) D. All four...
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This note was uploaded on 10/27/2010 for the course PHYS 2207 at Cornell University (Engineering School).

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P2207_fall10_lecture8 - r / T = inward acceleration of...

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