Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it. How much work is done by men in lifting the box?

Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it.How much work is done in just holding it? (Take g=10ms^(-2)).

A coolie lifts a box of 15 kg from the ground the a height of 2m. Calculate the work done by the coolie on the box.

A parallel plate capacitor having area 25 cm^2 and separation 1.00 mm is Connected to a battery of 6.0 V. Calculate the charge flown through the battery. How much work has been done by the battery during this process? (Given varepsilon_0=8.85xx10^-12C^2N^-1m^-2)

A parallel plate capacitor having area 25 cm^2 and separation 1.00 mm is Connected to a battery of 6.0 V. Calculate the charge flown through the battery. How much work has been done by the battery during this process? (Given varepsilon_0=8.85xx10^-12C^2N^-1m^-2)

Find the work done in lifting a 50 kg bucket a water through a vertical height of 2 m.

A person trying to lose weight (dieter) lifts a 10 kg mass, one thousand times, to a height of 0.5 m each time. Assume that the potential energy lost each time she lowers the massis dissipated:- How much work does she do against thegravitational force ?

A person trying to lose weight (dieter) lifts a 10 kg mass, one thousand times, to a height of 0.5 m each time. Assume that the potential energy lost each time she lowers the massis dissipated:- Fat supplies 3.8 xx 10^7J of energy per kilogram which is converted to mechanical energy with a 20% efficiency rate. How much fat will the dieter use up?

If a man lifts a load up with the help of rope such that it raises the load of mass 50 kg to a height of 20 m in 100 seconds. Find the power of man. (Take g = 10ms^-2 )

A hoop of radius 2 m weighs 100 kg. It rolls along a horizontal floor so that its centre of mass has a speed of 20 cm//s . How much work has to be done to stop it?