A hollow sphere of radius 25 cm is attached to a piece of wire of length 10 cm to form a physical pendulum. Assuming small amplitude motion and ignoring the mass of the wire, determine its period of oscillation.
2. A periodic wave is described by y = (0.15m)cos(10t + (Ď€/2)x) with x in meters and t in seconds. Determine
a) its wavelength
b) its speed
c) its direction of propagation
d) Sketch the wave at t = 0