View Poll Results: what sort of poll is this i dont know yes 1 50.00% no 1 50.00% Voters: 2. You may not vote on this poll

# Force required on Axel

by kalpesh
Tags: axel, force, required
 P: 7 Hello, This will be a very simple questions for all you pro's out there. I want to know the amount of horsepowers required to start the rotation and maintain a rotation of 20 RPM of an axel which has an arm of 4 mts having a load of 100 kgs at the end of the arm. the dia of tha axel is 1000mm (10 Cm.) and the leangth of the arm as stated above is 4 meters. Please help
 Sci Advisor P: 985 Technically the answer is 0. The only thing reason the system will need power to keep it going is because of friction, a variable you don't know. For a second I thought (mv^2)/r would have something to do with it but that force is exerted by the 4m bar and not a motor connected to a shaft. If you give a required torque specification for that given RPM, I can tell you how much power you need. btw, I voted no.
 P: 124 The final speed isn't important - what you need to decide is the rate at which your device (which sounds more like a centrifuge than an axle) gets to that speed, i.e the (angular) acceleration. Once it's up to speed you just need to overcome friction losses, etc to keep it there.

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