. 22. An electric kettle is required to heat 0.6 litre of water
from 10°C to boiling point in 5 min, the supply
voltage being 240 V. The efficiency of the kettle is 78
per cent. Calculate: (a) the resistance of the heating
element; (b) the cost of the energy consumed at
8.0p/kWh. Assume the specific heat capacity of water​

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j