Ahelicopter winches up an injured person from a boat. the person plus the equipment that must be pulled up with the person has a mass of 109 kg. the efficiency of the motor (the actual work done divided by the electrical energy consumed expressed as a percentage) is 69%. if the height of the lift is 83 m and it is carried out at a uniform rate over 55 s, what is the power expended by the helicopter's winch motor? (give your answer in watts)

When a person is pulled upwards why the motor of the helicopter

Then the potential energy increased  of the person is given as

here m = 109 kg

h = 83 m

so here potential energy of the person given as

now power is defined as rate of energy

so it took 55 s to pull the mass so power is given as

now we know that efficiency of motor is given as 69%

so we have

so we have power as

a displacement distance is size of displ

the higher the current the higher the mag field around it the higher the influence on the compass