David pushes on a box with a force of 11 Newtons to the right, and his friend pushes on the box with a force of 8 Newtons to the left. What is the net force acting on the box?

Waves that cause the most damage during an earthquake are a. surface waves c. s waves b. p waves d. ocean waves

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.