1.1. The photograph shows a machine at a coal mine.

^{© Andrew Curtis}

The machine lifts a load weighing 400 000 N through 190 m.

(i) State the relationship between work done, force and distance moved.

(1)

(ii) Calculate the work done on the load.

(2)

Work done on load = ....................... J

1.2. The machine uses an average (mean) power of 1.9 MW to do 67 MJ of work.

(i) Calculate the time needed to do this work.

(3)

Time = .................. s

(ii) State the effect of using a lower average power to do this work.

(1)