A small motorized winch is used to hoist a scientific sensor packet of mass 250 g250\text{ g}250 g vertically upwards.
The current through the motor is 1.4 A1.4\text{ A}1.4 A and the potential difference across it is 6.0 V6.0\text{ V}6.0 V. The motor operates for 4.5 s4.5\text{ s}4.5 s to lift the sensor packet.
Calculate the electrical energy transferred to the 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 250 g250\text{ g}250 g sensor packet to a height of 85 cm85\text{ cm}85 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 packet is less than the electrical energy transferred to the motor.
