Recent content by JayCAquino#4

I don't know how to use rpm to calculate power

What equation do I use to calculate my power input if the motor is connected to a shaft which is lifting a load off the ground. I know the rpm and the radius I just don't know how to put it all together

Oh okay so I should use power instead of work. Thanks for the help. Much appreciated

Using the formula useful work/total work input. I use mg(delta)h/ivt and this suggests efficiency is constant because when mass increases so does time. But how come when you take into account torque efficiency increases with load?

The motor runs on dc current. I understand efficiency is useful work/work input. It is attached to the pulley. I think efficiency will remain constant as long as voltage of mains and vertical height remain constant. Am I wrong? Other people claim efficiency increases with load

In terms of the ratios of the sides of triangles

What do the functions cosx/x and tanx/x represent?