Write two conditions where zero work is done even though force is applied. When does the work done is negative? Write one example.
Derive relation between S.I and CGS units of work.
Name the physical quantity measured in kilowatt hour? How is kilowatt hour related with SI unit of that physical quantity?
A weight lifter lifts a load of 200 kgf to a height of 2.5m in 5 seconds. Calculate
i) the work done by him
ii) power developed by him (g=10m/s2)
correct answer only otherwise it will be reported
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