Question

8. Two identical blocks of iron, one at 10 degrees C and the other at 20 degrees C, are put in contact. Suppose the cooler block cools to 5 degrees C and the warmer block warms to 50 degrees C. This would violate ___
a.   the first law of thermodynamics.
b.   the second law of thermodynamics.
c.   both the first and second law of thermodynamics
d.   neither law of thermodynamics….this happens all the time at my house!

21. If you use 17 J of work to push a charge into an electric field and then release the charge, as the charge flies past its starting position, its kinetic energy is
a. much more than 17 J.
b. much less than 17 J.
c. about 17 J.

36. What drives the commercial generators for most electricity?
a. wind.
b. falling water.
c. steam.
d. rain.

Answer 1

Question.8

Answer: Option 3 – Second Law of Thermodynamics

Explanation: The second law of thermodynamics states that the total entropy of an isolated system can never decrease over time, and is constant if and only if all processes are reversible. Isolated systems spontaneously evolve towards thermodynamic equilibrium, the state with maximum entropy.

Question.21

ANSWER::17joules

Explanation::here electric potential energy is converted to kinetic energy

Question::36

Answer :: steam