2. rocks that are tossed around in the ocean (salt water) will eventually wash up
on shore. rocks and pebbles in a river bed will often be eroded by running water
and deposited at the end of the river. which is true of the appearance of the rocks
and pebbles?
a. the rocks and pebbles will be rough and jagged
b. the rocks and pebbles will be smooth and rounded
c. the rocks and pebbles will be uneven and smooth
d. the rocks and pebbles will be rough and rounded
which of the following sentences is correct

I) a gas contained within a piston-cylinder assembly undergoes two processes, a and b, between the same end states, 1 and 2, where p1 = 10 bar, v1 = 0.1 m3 , u1 = 400 kj and p2 = 1 bar, v2 = 1.0 m3 , u2 = 200 kj: ' process a: process from 1 to 2 during which the pressure-volume relation is pv = constant. ' process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to state 2. kinetic and potential energy effects can be ignored. for each of the processes a and b, a) sketch the process on a p-v diagram. b) evaluate the work, in kj. c) evaluate the heat transfer, in kj.(ans : qb,12 = -65.0 kj)