Agas contained in a piston–cylinder assembly undergoes two processes, a and b, between the same end states, 1 and 2, where p1 = 1 bar, v1 = 1 m3, u1 = 400 kj and p2 = 6 bar, v2 = 0.167 m3, u2 = 420 kj: process a: constant-volume process from state 1 to a pressure of 6 bar, followed by a constant-pressure process to state 2. process b: process from 1 to 2 during which the pressure volume relation is pv = constant. kinetic and potential effects can be ignored. for each of the processes a and b, (a) evaluate the work, in kj, and (b) evaluate the heat transfer, in kj.

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The particle in a two-dimensional well is a useful model for the motion of electrons around the indole ring (3), the conjugated cycle found in the side chain of tryptophan. we may regard indole as a rectangle with sides of length 280 pm and 450 pm, with 10 electrons in the conjugated p system. as in case study 9.1, we assume that in the ground state of the molecule each quantized level is occupied by two electrons. (a) calculate the energy of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels. 9.27 electrons around the porphine ring (4), the conjugated macrocycle that forms the structural basis of the heme group and the chlorophylls. we may treat the group as a circular ring of radius 440 pm, with 20 electrons in the conjugated system moving along the perimeter of the ring. as in exercise 9.26, assume that in the ground state of the molecule quantized each level is occupied by two electrons. (a) calculate the energy and angular momentum of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels.

You have a pick-up truck that weighed 4,000 pounds when it was new. you are modifying it to increase its ground clearance. when you are finished