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1.A factory worker pushes a 30.4kg crate a distance of 4.00 m along a level floor at constant velocity by pushing downward at an angle of 28.0 below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.255 .

A.What magnitude of force must the worker apply to move the crate at constant velocity?

Take the free fall acceleration to be 9.8

B.How much work is done on the crate by this force when the crate is pushed a distance of 4.00 ?

Take the free fall acceleration to be 9.8

2.A pump is required to lift a mass of 790 of water per minute from a well of depth 13.8 and eject it with a speed of 18.1 .

A.How much work is done per minute in lifting the water?

Take the free fall acceleration to be = 9.80

B.How much in giving the water the kinetic energy it has when ejected?

C.What must be the power output of the pump?

Take the free fall acceleration to be = 9.80 .

NOTE; all the quantities are in SI units.