Weekly 07: Dynamics in Multiple Dimensions, Momentum and Impulse Item 6 60135 A

Question

Weekly 07: Dynamics in Multiple Dimensions, Momentum and Impulse Item 6 60135 A 300 g block on a 58.0 cm -long string swings in a circle on a horizontal, frictionless table at 75.0 rpm Part A What is the speed of the block? Express your answer with the appropriate units 273.18 m Submit Previous Answers Requ uest Answer Incorrect. Try Again: 29 attempts remaining Part B What is the tension in the string? Express your answer with the appropriate units 38600.3 N SubmitPr Previous Answers Request Answer Incorrect. Try Again: 29 attempts remaining

Explanation / Answer

Here ,

a) angular speed , w = 75 rpm = 75 * 2pi/60

w = 7.85 rad/s

radius , r = 0.58 m

speed of the block = r * w

speed of the block = 0.58 * 7.85

speed of the block = 4.55 m/s

part b) tension in the string = m * v^2/r

tension in the string = 0.300 * 4.55^2/.58

tension in the string = 10.7 N

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