I keep getting C and D on this quiz, I value my grades and education NOT SURE HOW THIS IS HAPPENING! How can you increase the gravitational potential energy (GPE) of an empty shoe box on the middle shelf of a bookcase? Question options:

all of the options listed here will increase the GPE

add items to the box to increase its mass on the self it is on

raise the box to a higher shelf

add items to the box and raise it to a higher shelf

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90