An ideal gas undergoes two processes in a piston-cylinder device as follows: 1-2 Polytropic compression from T1 and P1 with a polytropic exponent n and a compression ratio of r=V1/V2. 2-3 Constant pressure expansion at P3=P2 until V3=V1. (a) Sketch the processes on a single P−v diagram. (b) Obtain an expression for the ratio of the compression-to-expansion work as a function of n and r. (c) Find the value of this ratio for values of n = 1.4 and r = 6.

- measure reactants precisely. ( first choice)

- stir to the reaction take place. ( second choice)

- wait patiently until the reaction completes. ( fourth choice)

- make sure to recover as much copper as possible. ( last choice)

you have to draw the persons position over there

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .

higher potential

explanation:

because it is in a high speed so it must move into a of high potential