XA 2 2.1.4 Quiz: First Law of Thermodynamics
Question 2 of 10
2 Points
Which of the following situations would cause the greatest increase in the
motion of molecules in a system?
A. Q = +50 J, W = -50 J
O B. Q = +50 J, W = +50 J
O c. Q = -50 J, W = -50 J
O D. Q = -50 J, W = +50 J

A.

Q = +50 J, W = -50 J

Explanation:

According to first law of thermodynamics, which can be expressed as;

dU = Q - W

Where

dU = change in internal energy

Q = added heat

W = work done by the system

If W is positive, work is done on the system. And if Q is negative, the system loses heat to the surrounding.

In the question above, the situation that would cause the greatest increase in the motion of molecules in a system will be option A

Q = +50 J, W = -50 J

Since the system gained heat and work is been done by the system.

d) physical means can be used to separate the components of air.

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.