A miniature drone-mounted motorized winch is used to hoist a sensory payload packet.
The electrical current in the winch motor is 1.5 A1.5\text{ A}1.5 A and the potential difference across it is 9.6 V9.6\text{ V}9.6 V. The motor runs for 5.2 s5.2\text{ s}5.2 s to lift the payload.
Calculate the electrical energy transferred to the winch motor during this time. Give your answer to two significant figures.
State the equation linking gravitational potential energy (GPE), mass, ggg, and height.
The motor lifts the 450 g450\text{ g}450 g sensor packet to a height of 140 cm140\text{ cm}140 cm. Calculate the gravitational potential energy gained by the packet. (Use g=9.8 N/kgg = 9.8\text{ N/kg}g=9.8 N/kg or 10 N/kg10\text{ N/kg}10 N/kg). Give your answer to two significant figures.
Suggest two reasons why the gravitational potential energy gained by the sensor packet is less than the electrical energy transferred to the winch motor.