To learn the definition of power and how power, force, and velocity are related. the definition of work done by a force () does not include time. for practical purposes, however, it is often important to know how fast work is being done. the rate at which work is being done is called power p. the average power pavg can be calculated as p avg = w/delta t where w is the amount of work done during the time interval delta t. the power created by a force may be a constant; that is, work is being done at constant rate. however, this is not always the case. if the rate of performing work is changing, it makes sense to talk about the instantaneous power, defined as p = lim w/delta t . the si unit of power is the watt (w). one watt is defined as the power created when one joule of work is done each second. in equation form, one writes 1w = 1j/s . a commonly used unit of work is the kilowatt-hour (kwh). one kilowatt-hour is the amount of work done in one hour when the power is one kilowatt. in equation form, this is 1kwh = 1kw * 1 hour = 10^3 w * 3.6 * 10^3 s = 3.6 mj . in this problem, you will answer several questions that will familiarize you with power and enable you to derive a formula relating power, force, and velocity. part e: a sled of mass is being pulled horizontally by a constant diagonally upward force of magnitude that makes an angle with the direction of motion. the coefficient of kinetic friction is . the average velocity of the sled is . find the average power pavg created by force f. express your answer in terms of f , cos angle, and v avg. let us now consider some questions that include numeric data. a sled is being pulled along a horizontal surface by a horizontal force of magnitude 600 . starting from rest, the sled speeds up with acceleration 0.08 for 1 minute. part f: find the average power pavg created by the force f . express your answer in watts to three significant figures. pavg = ? unit is w part g: find the instantaneous power p created by the force f at 10s. p = is w