An incident ray comes in parallel to the principle axis of a concave mirror. Is it reflected:
w) back along the incident ray
x) at 30 degrees to incident ray
y) through the focal point
z) through the center of curvature

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted

Aboy with a mass 25 kg climbs into a small tree. he sits on a branch that is 2.o m above to the ground.what is his gravitational potential energy above the ground?

Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. what is the best explanation of the relationship between wavelength and wave energy? a) wave energy is related only to frequency, not wavelength. b) longer wavelengths have lower frequencies but higher energy. c) the shorter the wavelength, the lower the frequency and the higher the energy. d) the shorter the wavelength, the higher the frequency and the higher the energy.