Astone with heat capacity c = 1.2 j/k is left outside on a cold day to reach a temperature of 273.15 k. the stone is then brought inside where the air temperature is 293.15 k. the stone is used as the cold side of a reversible engine. (the air is the hot side.) what is the maximum work that can be accomplished ?

To solve the problem it is necessary to apply the concepts related to Helmholtz free energy. By definition in a thermodynamic system the Helmholtz energy is defined as

Where,

is the internal energy equivalent to

And means the change in entropy represented as

Note: C means heat capacity.

Replacing in the general equation we have to

The work done of a thermodynamic system is related by Helmholtz free energy as,

Replacing with our values we have,

Therefore the maximum work that can be accomplished is 0.858J

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2