Arock is dropped from a cliff.

what will eventually happen to the rock's motion?
a. gravity will cause the rock to slow down before it reaches earth.
b. air resistance will cause the rock to accelerate as it falls.
c. the rock will continue falling until earth exerts a contact force on the rock.
d. friction will cause the rock to continue in its state of motion.

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?

Aparticle of mass m is placed in a one-dimensional box of length l. the box is so small that the particle’s motion is relativistic, so that e p2/2m is not valid. (a) derive an expression for the energy levels of the particle using the relativistic energy–momentum relation and the quantization of momentum that derives from connement. (b) if the particle is an electron in a box of length l 1.00 1012 m, nd its lowest possible kinetic energy. by what percent is the nonrelativistic formula for the energy in error?

Where should a carbon monoxide detector be mounted?