when it is brought up to a speed of 46.0 rev/min, provided the button is no more

Question

when it is brought up to a speed of 46.0 rev/min, provided the button is no more than A small button placed on a 0.135 m from the axis 0.320 m without slipping. You ale called as an expert witness in the trial of a traffic violation. The facts are the skid marks on the pavement indicate that he locked his car's wheels, the car traveled 193 ft before stopping, and the coefficient of kinetic friction between the road and his tires was 0.754. The charge is that he was speeding in a 45-mih zone. He pleads innocent What is your conclusion, guilty or innocent? O guilty innocent How fast was he going when he hit his brakes? mi/h

Explanation / Answer

Solution- a) = 46 rev/min = 46 x 2 /60 = 4.81 rad/s

Now on button,

mg = m2 r

x 9.81 = 4.81^2 x 0.135

= 0.32

b) = 61 rev/min = 61 x 2 /60 = 6.38 rad/s

mg = m2 r   

0.32 x 9.81 = 6.38^2x r

r = 0.077 m

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