Four men light a 250 kg box to a height of 1m and hold it without raising or lowering it. (a) How much work is done by the men in lifting the box ? (b) How much work do they do in just holding it ? (c ) why do they get tired while holding it ? `(g = 10m//s^2)`

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. (i) How much work is done by men in lifting the box? (ii) How much work is done in just holding it? (Take g=10ms^(-2) ).

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)).

In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m. (a) How much work does he do in lifting one box ? (b) How much energy is transferred when one box is lifted ? (c) If the man lifts 4 boxes per minute, at what power is he working ? ( g = 10 m s^(-2 )

A fork lift moves 34 m carrying a 1023 N box across the warehouse floor. How much work is done by the fork lift.

A factory worker pushes a 25.0 kg crate downward at an angle of 30^(@) below the horizontal a distance of 6.0 m along a level floor. (a) What magnitude of force must the worker apply to move the crate at constant velocity, if the coefficient of kinetic friction between the crate and floor is 0.3 ? (b) How much work is done on the crate by this force when the crate is pushed a distance of 6.0 m? (c) How much work is done on the crate by friction during this displacement ? (d) How much work is done by the normal force and by gracity ? (e) What is the total work done on the crate ? Take g=10m//s^(2)