A city requires 10^7 watts of electrical power on the average. If this is supplied by a nuclear reactor of efficiency 20% .using Uranium is the fuel source. calculate the amount of fuel required perday. (protons of uranium=235)
(neutrons of uranium=92)
(Energy released per fission uranium=200Mev)

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?

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?