# Homework Help: Piston Problem Revised

1. Feb 7, 2005

In an engine, a 7-inch connecting rod is fastened to a crank of radius 3 inches. The clankshaft rotates counterclockwise at a constant rate of 200 revolutions per minute. Find the velocity of the piston when $$\theta = \frac{\pi}{3}$$.

I know that I have to use the Law Of Cosines. However I am unclear about the question.

Any ideas and help are appreciated

Thanks

2. Feb 7, 2005

any ideas?

3. Feb 7, 2005

### FredGarvin

The question is asking you to figure out the linear velocity of the piston when the crank has rotated, at constant speed, to the angular position is 60°.

4. Feb 7, 2005

how would you use implicit differentiaition?

5. Feb 7, 2005