You rev your car\'s engine and watch the tachometer climb steadily from 1200 rpm

Question

You rev your car's engine and watch the tachometer climb steadily from 1200 rpm to 5500 rpm in 2.7 s. Part A What is the angular acceleration of the engine? Express your answer using two significant figures. av = rad/s2 SubmitMy AnswersGive Up Part B What is the tangential acceleration of a point on the edge of the engine's 3.5cm-diameter crankshaft? Express your answer using two significant figures. at = m/s2 SubmitMy AnswersGive Up Part C How many revolutions does the engine make during this time?

Explanation / Answer

w1 = 1200 rpm = 1200*2*pi/60 = 125.7 rad/s

w2 = 5500 rpm = 5500*2*pi/60 = 575.96 rad/s

alfa = (w2-w1)/t

= (575.96 - 125.7)/2.7

= 166.8 rad/s^2 <<<<<<<<<-----------Answer

a_tan = r*alfa

= (0.035/2)*166.8

= 2.92 m/s^2 <<<<<<<<<-----------Answer

angular dispalcement, theta = (w2^2 - w1^2)/(2*alfa)

= (575.96^2 - 125.7^2)/(2*166.8)

= 947 rad

= 947/(2*pi)

= 151 <<<<<<<<<-----------Answer

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