1. The problem statement, all variables and given/known data (a) The Earth may be considered to be a uniform sphere of radius 6.37 × 103 km with its mass of 5.98 × 1024 kg concentrated at its centre. The Earth spins on its axis with a period of 24.0 hours. (i) A stone of mass 2.50 kg rests on the Earth’s surface at the Equator. 1. Calculate, using Newton’s law of gravitation, the gravitational force on the stone. 2. Determine the force required to maintain the stone in its circular path. (ii) The stone is now hung from a newton-meter. Use your answers in (i) to determine the reading on the meter. Give your answer to three significant figures. 2. Relevant equations F= GMm/r^2 and F= mw^2r 3. The attempt at a solution I got the solution for 1. 24.6 N and 2. 0.0842 N but I don't understand why is (ii) or the weight the difference between these two values? Why do we have to subtract Fg-Fc, aren't they supposed to be the same thing?