Number 10.3. ,10.4 .Please help me

b) Calcula (c) Calculate the time period if the hole were drilled through the Moon. 10.3. In Fig. 10.3, if there are a large number of forces acting on M, the result of combining them should be a single force and a torque. Why is there no torque? (Hint: Take an arbitrary point P and show that the forces pass through it.) 10.4. An object of mass m released at a very large distance from Earth falls toward Earth's center. Cal- culate the time it will take (a) to reach halfway to Earth's center, and (b) to reach from balfway to