A 2.5 kg ball swings in a horizontal circular path at the end of a string. The radius of the circle is 0.6 m and the ball makes 4 revolutions in a second. Calculate the centripetal acceleration of the ball.

If a spring has a k value of 100 newtons per meter and it is stretched 0.50 meters, what is the restoring force of the spring?

More solar radiation is absorbed by earth’s surface than by

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?