Q: Would you expect the total energy of the solar system to be constant ? The total angular momentum ? Explain
Sol: Yes The gravitational forces are conservative . When a system is under the action of conservative forces , its total energy (K.E + P.E) is constant and hence the energy of the solar system is constant . The gravitational on planets of the solar system are central forces directed towards the sun and hence the moment of forces about the sun is zero . Thus no torque acts on the planets and the angular momentum is constant .