Posted by **Charles** on Wednesday, February 6, 2008 at 9:32pm.

If gear A has 30 teeth and is spinning at 800rpm, gear B has 50 teeth and gear C has 20 teeth and gear D is spinning at 300rpm. How many teeth does gear D have?

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**Damon**, Wednesday, February 6, 2008 at 9:41pm
rpms if all in a row

If any are on the same shaft. I do not have your picture.

B 800*(30/50)

C 800*(30/50)*(50/20)

D 800*(30/50)*(50/20)*(20/N) = 300

or more easily since all teeth are the same size

800*(30/N) = 300

N = 80

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**Damon**, Wednesday, February 6, 2008 at 9:50pm
Now you tell me !

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**Charles**, Wednesday, February 6, 2008 at 9:51pm
sorry

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**Damon**, Wednesday, February 6, 2008 at 9:53pm
B = 800*30/50 = 480 rpm

so

C = 480 rpm

D = 480 (20/N) = 300

N = 32

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**Charles**, Wednesday, February 6, 2008 at 9:58pm
thank you

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**Damon**, Wednesday, February 6, 2008 at 9:59pm
You are welcome :)

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**Damon**, Wednesday, February 6, 2008 at 10:48pm
Think of the body all alone in space

Add up all the force vectors on it and equate that to mass times acceleration.

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