An electric motor is tested and found 76% efficient. if the input work is 400 J, what is the motors output work?
A ramp has a length of 4m and a height of 1.5m. If a man pushes a 40N crate to the top of the ramp with a force of 60N, what is the efficiency of the ramp?
Explain what a perpetual motion machine is, and explain why it's impossible
How do I do these three questions?
Thanks in advance
A ramp has a length of 4m and a height of 1.5m. If a man pushes a 40N crate to the top of the ramp with a force of 60N, what is the efficiency of the ramp?
Explain what a perpetual motion machine is, and explain why it's impossible
How do I do these three questions?
Thanks in advance
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1) 400 J*.76 = 304 J
2) Eff = Wout/Win = (h*W)/(F*D) = 1.5*40/(60*4) = .25 = 25%
3)
a) How can I explain the impossible?
b) The entire universe is a perpetual motion machine, so clearly it IS possible.
2) Eff = Wout/Win = (h*W)/(F*D) = 1.5*40/(60*4) = .25 = 25%
3)
a) How can I explain the impossible?
b) The entire universe is a perpetual motion machine, so clearly it IS possible.