According to el-wakil, the terrestrial radiation received by the continental u. s. is about 2.2×1016 kw hr/yr. if all of the electricity in the u. s. were produced using photovoltaics with a sunlight-to-electricity conversion efficiency of 15%, determine how many years into the future it will be before the entire surface of the united states is covered with solar panels. for the electric load, utilize the total electricity net generation datum from 2018 as the baseline, and assume that the electrical consumption rate grows at a rate of 1.5% per year.

Abatter hits the baseball a with an initial velocity of v0 = 110 ft/sec directly toward fielder b at an angle of 23° to the horizontal; the initial position of the ball is 2.2 ft above ground level. fielder b requires 0.44 sec to judge where the ball should be caught and begins moving to that position with constant speed. because of great experience, fielder b chooses his running speed so that he arrives at the “catch position” simultaneously with the baseball. the catch position is the field location at which the ball altitude is 8.4 ft. determine the velocity of the ball relative to the fielder at the instant the catch is made.

From center station, a train departs every 30 minutes on the fast line and a train departs every 50 minutes on the state line. if two trains depart from center station at 8: 00 a.m., one on each of the two lines, what is the next time that two trains, one on each line, will depart at the same time?

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain