A pulley on a frictionless shaft has a constant tension T applied at its outer rim of radius R and a weight W tied to a string wrapped around its inner shaft of radius r. If the system is to remain at rest, what must the tension T be?

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?

Why is the use of carbon-14 limited

Which is not true of the intertropical convergence zone? a) it features heavy precipitation b) it's where the trade winds collidec) it's a high-pressure zone with sinking air d) it is also known as the doldrums