Alead block of mass 6.6 kg is originally at a temperature of 26°c and 1 atm. it is then heated to a temperature of 68°c without any change in pressure. the specific heat of lead is 128 j/(kg.°c), its density is 1.13 104 kg/m^3, and the coefficient of linear expansion is 29 ✕ 10^−6 /°c. (a) determine the work done by the lead block.
(b) how much heat energy is transferred during this process?
(c) what is the increase in internal energy of the system?

Amplitude is a measure of a waves a; speed b; distance c; energy d; frequency

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.)

Which of the following compounds would be primarily ionic? methane, ch4, ammonia nh3, calcium chloride, cacl2, or carbon dioxide, co2