An actual light bulb is shown below, with a concave mirror. The blue dot is the focal point of the mirror. What best describes the unseen image of this bulb?

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? ?

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.

If you put a helium-filled balloon in the refrigerator, what will happen?