Estimate the mass of blood in your body explain your reasoning (note: it is not enough to provide a numeric answer. the main point of this problem is to assess your reasoning ability)

If the speed of a particle triples ,by what factor does its kinetic energy increase?

The 5-kg cylinder is initially at rest when it is placed in contact with the wall b and the rotor at a. if the rotor always maintains a constant clockwise angular velocity v = 6 rad> s, determine the initial angular acceleration of the cylinder. the coefficient of kinetic friction at the contacting surfaces b and c is mk = 0.2.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.