Answer Happy

A simple pendulum of length L, has a maximum angular displacement 0_max. At one point in its motion, its kinetic energy is K = 3 J and its potential energy is U = 4.2 J. When the pendulum's angular velocity is half its maximum value (0' = 0'_max/2), then its kinetic energy is:
The function of a wave on a stretched string is given by: y(x,t) = 0.4 sin(wt - kx + p) where x is in meters and t in seconds. At = O, an element of the string at x = 0 has a vertical displacement of 0.2 m and is moving in the negative y-direction. The direction of travel of the wave and the phase constant o are given by: