Question 2 of 25 Which symbol in the first law of thermodynamics represents the result of a

gas expanding against a constant pressure?

O A. a

B. V

C. U

D. W

The symbol representing  the result of a  gas expanding against a constant pressure is W

Explanation:

According to first law of thermodynamics, energy can neither be destroyed nor created but rather transferred to one place to another and converted to and from other energy forms.

The mathematical form of first law of thermodynamics is:

where = change in internal energy

q = heat absorbed or released

W = work  

P = pressure

= volume change

Thus the changes in heat or work leads to change in internal energy.

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it