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Old 03-21-2006, 05:14 PM   #1
PCMarine
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Default Physics question: non-uniform circular motion

A crankshaft, with a diameter of 3.00 cm, rotating at 2200 rpm comes to a halt in 1.50 s.

Q1: What is the tangential acceleration of a point on the surface of the crankshaft?

I think I have to convert 2200 rpm to m/s (velocity), to find the acceleration (change in velocity/1.50s). Then divide the acceleration by the radius. However, I don't know how to do the rpm to m/s conversion.


Q2: How many revolutions does the crankshaft make as it stops?

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Old 03-21-2006, 05:19 PM   #2
jagec
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Default Physics question: non-uniform circular motion

Find the circumference of the shaft, which is easy. Now, you know the velocity at the surface is RPM * circumference (divide by 6000 to convert to m/s, by default it will be cm/min)

Start with that, let us know how it goes.
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Old 03-21-2006, 05:48 PM   #3
PCMarine
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Default Physics question: non-uniform circular motion

alright thanks, I got -2.30 m/s^2 for Q1
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Old 03-21-2006, 05:51 PM   #4
Eli
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Default Physics question: non-uniform circular motion

Interesting question.. What are you studying for?
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Old 03-21-2006, 08:16 PM   #5
PCMarine
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Default Physics question: non-uniform circular motion

circular motion, specifically non uniform
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Old 03-21-2006, 08:19 PM   #6
PurdueRy
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Default Physics question: non-uniform circular motion

for Q2..now that you have accel...you can use a simple physics equation to calculate how far it will go before it slows to 0 m/s. Divide this by the circumference
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