A cooling fan is turned off when it is running at 950rev/min . It turns 1500 rev

ID: 3157288 • Letter: A

Question

A cooling fan is turned off when it is running at 950rev/min . It turns 1500 revolutions before it comes to a stop.

Part A

What was the fan's angular acceleration, assumed constant?

Express your answer using two significant figures.

Part B

How long did it take the fan to come to a complete stop?

Express your answer using two significant figures.

A cooling fan is turned off when it is running at 950rev/min . It turns 1500 revolutions before it comes to a stop.

Part A

What was the fan's angular acceleration, assumed constant?

Express your answer using two significant figures.

= rad/s2

Part B

How long did it take the fan to come to a complete stop?

Express your answer using two significant figures.

t = s

Since angular acceleration is constant

Wave = 950/2 = 475rev/min

t = no of revolutions / wave = 1500 / 475 = 3.1579 minutes

t = 3.1579*60 = 189.47 second

This is an answer for b) part.

a = 950/3.1579 = -300.8333 rev/min^2

a = -300.8333*(2*3.14159) / 3600 = -0.53 rad/s2

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