PLZ HLEP ME 100 POINTS AND BRAINLEIST
A doorknob is a simple machine known as a wheel and axle has a mechanical advantage of one, so it's easier to turn, but the trade off is that is moves a shorter distance.
A. less than one
B. greater than one
C. the same as
D. none of the above

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Asimple electrochemical cell contains two electrodes.

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)