Calculate Efficiency of Motor Lifting 0.050kg Block at 0.40m/s

[IDK10]

Rate of change of potential energy d(mgh)/dt =mg dh/dt = mg x v = Fx v = power needed to maintain the constant velocity, where from you can find efficiency if you know the input power

The fact that you used d(mgh)/dt confuses me, since we don't do that, and you put it on one line.

 

[malemdk]

sorry

 

[malemdk]

Just one minor issue. The voltage was 3.0 V.

yes

 

[TomHart]

The fact that you used d(mgh)/dt confuses me, since we don't do that, and you put it on one line.

Are you familiar with the equation Power = Force x Velocity?

 

[malemdk]

Yes , I designed many ,many machines using this equation .
it can be derived from Newtons second law

 

[TomHart]

Yes , I designed many ,many machines using this equation .

I was asking @IDK10. He seemed to be having trouble understanding your solution.

 

[malemdk]

ok