The solid spindle AB is made of steel with an allowable shearing stress of 15ksi, and sleeve CD is made of brass with an allowable shearing stress of 9ksi. Determine (a) the largest torque T that can be applied at A if the allowable shearing stress is not to be exceeded in the sleeve CD, (b) the corresponding required value of the diameter d of the spindle AB.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.