A pump is required to lift 800 kg of water per minute from a well 13.8 m deep and eject it with a speed of 17.9 m/s. How much work is done per minute in lifting the water? How much work is done in giving the water the kinetic energy it has when ejected?

A cylindrical water tank 4 meters high with a radius of 2 metess is buried so that the top of the tank is 1 meter below ground level (see figure), How much work is done in pumping a full tank of water up to ground level? (the water weighs 9500 newtons per cubic meter.) newton meters y sl. Ground level 5-y

An airplane pilot fell to the ground after jumping from an aircraft without his parachute opening. He lands in a snowbank, creating a crater 2.1 m deep, but survived with only minor injuries.  Assuming the pilot’s mass was 68 kg and his terminal velocity was 35 m/s (the velocity at the point he stopped accelerating on his way down), what is: a) the average force exerted on him by the snow in bringing him to rest?  b) the work done by the snow?

Steel ball with radius of 0.03 m lays on a bottom of the lake 5 m deep. What work is needed to lift the ball to the surface of the lake? Density of steel  is 7860kg/m3. The volume of a sphere is  Use g = 9.8 m/s2 Calculate answer to two decimals.