At very low temperatures, the molar heat capacity of rock salt varies with temperature according to debyeâs t 3 law: c = k t 3 î¸ 3 , where k = 1940 j/(molâ·k) and î¸ = 281 k.
a. weâve learned the relation q = ncât for the molar heat capacity, which works well when the molar heat capacity is a constant. how do you think we should handle a situation in which the heat capacity varies with temperature? (hint: this is what calculus is how did we calculate work by a force that varies with position, like the force from a spring? ) find a way to calculate the amount of heat required to raise the temperature of 1.50 mol of rock salt from 11.0 k to 45.0 k; show your work and explain your reasoning.

Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f