Due to a gravitational torque exerted by the Moon on the Earth, our planets rotation period slows

Question:

Due to a gravitational torque exerted by the Moon on the Earth, our planet€™s rotation period slows at a rate on the order of 1 ms/century.
(a) Determine the order of magnitude of the Earth€™s angular acceleration. (b) Find the order of magnitude of the torque.
(c) Find the order of magnitude of the size of the wrench an ordinary person would need to exert such a torque, as in Figure P10.67. Assume the person can brace his feet against a solid firmament.

Due to a gravitational torque exerted