Aswimmer can swim in still water at a speed of 9.50 m/s. he intends to swim directly across a river that has a downstream current of 3.75 m/s. 46. a. what must the swimmer’s direction be? b. what is his velocity relative to the bank?

Sound is a disturbance that travels through a medium as a

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?

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?