Electrons flow very slowly through a circuit, yet it does not take a noticeably long time for a lamp to light up when you turn on a distant switch. How quickly a lamp lights up after an electrical switch is closed does not depend on the drift velocity of the conduction electrons, but depends on the speed at which the propagates through the circuit, which is about the speed of light.

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c