Q. A light bulb emits light uniformly in all directions. The average emitted power is 150.0 W. At a distance of 4.50 m from the bulb, determine (a) the average intensity of the light, (b) the rms value of the electric field, and (c) the peak value of the electric field.
Q. Typically,a tennis ball hit during a serve travels away at about 51m/s.if the ball is at rest mid-air when struck,and it has a mass of 0.058kg,what is the change in its momentum on leaving the rocket?