Which could cause a satellite to descend low enough that it burns up in earth's atmosphere

Current from a charged capacitor lights a bulb. as time goes on the brightness of the

Would it be correct to say the doppler effect is the apparent change in the speed of a wave due to the motion of the source? be sure to fully explain your position using at least 3 complete content related sentences.

The power exerted by a muscle is the product of the force exerted and the velocity of contraction. the area of which of these shaded regions represents the power exerted while a weight is lifted at maximum speed?