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PHYS103 – PHYSICS II HOMEWORK

PHYSICS II HOMEWORK

CHAPTER 15 HOMEWORK: THERMODYNAMICS

Resources:

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Question 1

Explanation

Part A U=Q-W “Isothermal” means no change in temp. U=change in temp. Therefore U = 0 Part B 0 = x – 2.7e3 x= 2.7e3

Question 2

Explanation

e = W / Q = W / W + QL = 2100 / (2100 + 9200) = .1858 = 18.58%

Question 3

Explanation

the efficiency is given by E = (Tw – Tc) / Tw where T is absolute temperature:w for warm & c for cold *Remember to convert your temperatures to Kelvin by adding 273 to each.

Question 4

Explanation

To find total heat generated: (.39)(x) = 570 x = 1461.54 Total heat generated – heat put out= heat discharged 1461.54 – 570 = 891.54

Question 5

Explanation

275.5 / (295 – 275.5) = 14.13 *Remember to convert to Kelvin