A hoist powered by a 10 kw motor is used to raise a bucket filled wirh concrete and having total mass of 500 kg to height of 80 m. if the efficiency of the hoist is 80 percent, find Time needed

Question

A hoist powered by a 10 kw motor is used to raise a bucket  filled wirh  concrete and having total mass of 500 kg to height of 80 m. if  the efficiency of the hoist is 80 percent, find Time needed

R_scott · Answer

m g h = 500 * 9.8 * 80 Joules 80% of 10 kw is 8 kJ per second looks like about a minute

Mike · Answer

A hoist powered by a 15-kW motor is used to raise a bucket filled with concrete and having a total mass of 500 kg to a height of 60 m