Predict whether the energy required to remove an electron from lithium would be more or less than that required to remove an electron from sodium. Explain your prediction in terms of the forces and interactions involved in this process.

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

If forces acting on an object are unbalanced. true or false

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)