O bila avand masa m=2kg cade liber de la inaltimea h=20m fata de sol. Cand bila trece printr-un punct P energia potentiala a sistemului bila-Pamant este o treime din energia sa cinetica.(g=10N/kg) a) La ce inaltime fata de sol se gaseste punctul P?

b) Care este energia cinetica a bilei cand trece prin punctul P?

c) Care este viteza cu care corpul atinge solul?

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

Suppose water is leaking from a tank through a circular hole of area ah at its bottom. when water leaks through a hole, friction and contraction of the stream near the hole reduce the volume of water leaving the tank per second to cah 2gh , where c (0 < c < 1) is an empirical constant. a tank in the form of a right-circular cone standing on end, vertex down, is leaking water through a circular hole in its bottom. (assume the removed apex of the cone is of negligible height and volume.) (a) suppose the tank is 20 feet high and has radius 8 feet and the circular hole has radius 2 inches. the differential equation governing the height h in feet of water leaking from a tank after t seconds is dh dt = − 5 6h3/2 . if the height of the water is initially 8 feet, how long will it take the tank to empty? (round your answer to two decimal places.)

Suppose while hauling rocks, you accidentally drop one. it breaks apart in flat, planar sections. what type of rock did you just drop? 20 points