A 0.70 kg ball on a 0.20 m string rotates in a circular path in a vertical plane. If a constant angular speed of 3.0 rad/s is maintained, what is the tension in the string when the ball is at the top of the circle? A. 0.8 N
B. 3.33 N
C. 5.64 N
D. 11.6 N

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?

This is one type of line graph in which the independent variable is time plotted on the x axis and the dependent variable, also numerical, is plotted on the y axis.

Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match