Physics Physics Practice Problems Solutions Library

# Entropy and the Second Law Solutions Library

Access 18 Entropy and the Second Law video and text solutions to help you complete your homework. Need to revisit the concept? Watch our Entropy and the Second Law learn videos.

### Browse Solutions

18 solutions

Entropy and the Second Law

#### Q. a. An object at 400 K absorbs 25.0 kJ of heat from the surroundings. What is the change in entropy ΔS of the object? Assume that the temperature of...

Solved • May 29, 2020

Entropy and the Second Law

#### Q. a. An object at 20°C absorbs 25.0 kJ of heat. What is the change in entropy ΔS of the object? Express your answer numerically in joules per kelvin....

Solved • May 21, 2020

Entropy and the Second Law

#### Q. Why must every heat engine have a cold reservoir?a) Because it is impossible for even a perfect engine to convert heat entirely into mechanical wor...

Solved • May 11, 2020

Entropy and the Second Law

#### Q. How would you increase the coefficient of performance of an ideal refrigerator?a) Increase the mechanical work input.b) Decrease the outside temper...

Solved • May 11, 2020

Entropy and the Second Law

#### Q. To increase the efficiency of an ideal heat engine, one must increase which of the following?a) the amount of heat consumed per secondb) the temper...

Solved • May 11, 2020

Entropy and the Second Law

#### Q. If the coefficient of performance of a refrigerator is 1, which the following statements is true?a) The temperature outside equals the temperature ...

Solved • May 11, 2020

Entropy and the Second Law

#### Q. According to the second law of thermodynamics, it is impossible for ____________.a) heat energy to flow from a colder body to a hotter bodyb) an id...

Solved • May 11, 2020

Entropy and the Second Law

#### Q. The thermodynamic processes that occur in nature ____________.a) convert thermal energy into mechanical energyb) lead to a more ordered statec) can...

Solved • May 2, 2020

Entropy and the Second Law

#### Q. How does the entropy of steam compare to the entropy of ice? a) The entropy of ice is larger because it is more ordered than steam. b) They are the...

Solved • May 2, 2020

Entropy and the Second Law

#### Q. Which of the following violates the second law of thermodynamics? (TH &gt; TC)A. Heat taken from a body at TH is converted completely into work.B. ...

Solved • May 30, 2017

Entropy and the Second Law

#### Q. Using the Einstein model of a solid, what is the change in entropy when adding two quanta of energy to a system of 5 atoms that already has 5 quant...

Solved • May 16, 2017

Entropy and the Second Law

#### Q. Blocks A and B have 300 and 200 oscillators, respectively. The blocks are placed in contact with each other in an insulated environment. At the ins...

Solved • May 16, 2017

Entropy and the Second Law

#### Q. An ideal gas is taken through the cycle shown in the diagram below. The process is carried out with 150 mg of Helium, which is a monoatomic gas wit...

Solved • May 10, 2017

Entropy and the Second Law

#### Q. A system takes in 200 J of heat while undergoing an isothermal change of state at 500 K. What is ΔU, ΔS, W, and Q for this change of state? A. ΔU ...

Solved • May 8, 2017

Entropy and the Second Law

#### Q. During an adiabatic change of state for an ideal gas 20 J of work are done on the surroundings. During this change, the temperature decreases from ...

Solved • May 8, 2017

Entropy and the Second Law

#### Q. An engineer claims to have built four engines. When operating between two reservoirs at 400 K and 300 K, the engines have the following characteris...

Solved • May 3, 2017

Entropy and the Second Law

#### Q. A glass of water is left outside overnight to freeze. During this process, which of the following statements about entropy is true? A) The entropy...

Solved • May 1, 2017

Entropy and the Second Law

#### Q. n moles of an ideal gas expands while the temperature of the gas remains constant. In this process the entropy of the gas  (a) remains constant (...

Solved • Jan 25, 2017