posted by Charles on .
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?
rpms if all in a row
If any are on the same shaft. I do not have your picture.
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
B and C are on the same shaft
Now you tell me !
B = 800*30/50 = 480 rpm
C = 480 rpm
D = 480 (20/N) = 300
N = 32
You are welcome :)
How exactly does Free Body Diagrams work?
Think of the body all alone in space
Add up all the force vectors on it and equate that to mass times acceleration.