A horizontal light ray reflects upward from a plane mirror that makes an acute angle φ with the horizontal. The reflected ray makes an angle α = 78° with the incident ray.

What value are the angles θ and φ, in degrees

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

What is the measure of a change in an objects velocity?

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.