A gymnast is swinging around a high bar with an initial angular velocity of 2.06 rad/s. He wishes to stop his angular motion in 0.7s. What angular
acceleration must he achieve in this time to come to rest in rad/s^2)?

What happens to atoms and chemical bonds during a reaction?

Which two particles are found in the center of an atom

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?