In general relativity, gravitational red shift is caused by

a. the slowing of clocks due to increased gravitational kinetic energy.

b. the slowing of clocks due to increased gravitational potential energy.

c. the slowing of clocks due to lower gravitational kinetic energy.

d. the slowing of clocks due to lower gravitational potential energy.

Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?