Ahollow cubical box is 0.221 m on an edge. this box is floating in a lake with 1/4 of its height beneath the surface. the walls of the box have a negligible thickness. water is poured into the box. what is the depth of the water in the box at the instant the box begins to sink

In the sport of parasailing, a person is attached to a rope being pulled by a boat while hanging from a parachute-like sail. a rider is towed at a constant speed by a rope that is at an angle of 15 ∘ from horizontal. the tension in the rope is 1900 n. the force of the sail on the rider is 30∘ from horizontal. what is the weight of the rider? express your answer with the appropriate units.

The solar panels used by mark function because of the photoelectric effect. light shines on the cells causing electrons to be ejected from the metal, which produces an electric current. at night on mars, no light will fall on the solar cells and no electric current will be generated. according to your notes, what type of light is typically needed to cause the photoelectric effect? a)visible b)ultraviolet c)infrared

Determine the maximum r-value of the polar equation r =3+3 cos 0