Homework #7 Rotational Motion.docx

# Homework #7 Rotational Motion.docx - Mariah Duran Prof Tsen...

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Mariah Duran Prof. Tsen MWF 11:50 Homework #7 1.The wheel of a car has a radius of 0.413 m. If the wheel rotates at 456 revolutions per minute, what is the speed (in m/s) at which the outer edge of the wheel is moving? 456 rev min 1 min 60 s 2 πrad 1 rev = 76 π 5 rad s v t = ωr v t = 76 π 5 rad s 0.413 m = 19.7 m s 2.(a)What is the maximum speed that a car can maneuver over a circular turn of radius r = 75.0 m without sliding if the coefficient of static friction is µ s = 0.780? μ s = v 2 gr 0.780 = v 2 ( 9.80 m s 2 75.0 m ) v 2 = 573.3 m 2 / s 2 v = 23.9 m s (b) What is the maximum speed that a car can maneuver over a circular turn of radius r = 25.0 m without sliding if the coefficient of static friction is µ s = 0.120? μ s = v 2 gr 0.120 = v 2 ( 9.80 m s 2 25 ) v 2 = 29.4

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v = 5.42 3. Suppose that two balls are attached to a rigid massless rod of length 2L, where L = 0.550 m. One is attached at one end of the rod and the other at the middle of the rod. If the rod is held by the open end and rotates in a circular motion with angular speed of 45.6 revolutions per second (285.5 rad/s), both balls have equal mass of 5.00 kg
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• Spring '08
• Cavatto
• Mass, µs, 0.413m

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