Questions
A lifting machine, having an efficiency of 80% uses 2500 J of energy in lifting a 10 kg load over a certain height. If the load is now allowed to fall through that height freely, its velocity at the end of the fall will be (take acceleration due to gravity as 10 m/s2 )…….ms-1
detailed solution
Correct option is C
80100x 2500 =10 v22 v =20 ms-1Talk to our academic expert!
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A simple pendulum is swinging in a vertical plane. The ratio of its potential energies when it is making angles and with the vertical is,
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