The average distance between the centres of the Earth and the Moon is 3.84×105km. The mass of the Earth is 6.0×1024kg and that of the Moon is 7.4×1022kg.
(i) Convert the given distance into metres.
(ii) Calculate the magnitude of the gravitational force between the Earth and the Moon. Express your answer in scientific notation correct to three significant figures.
(iii) Along which line does this gravitational force act on each body? State your answer briefly.