The correct answer is B) A waterfall. Hope this helps.
Explanation:
It is known that energy balance relation is as follows.

Also, 
so,
According to the ideal gas equation,

Putting the values into the above equation as follows.

= 
= 693.3 R
Now, we will convert the temperature into degree Fahrenheit as follows.
693.3 - 458.67
= 
From table A-
= 0.240 Btu/lbm R and
= 0.171 Btu/lbm
Now, we will substitute the energy balance as follows.
= 
= 59.3 Btu
Thus, we can conclude that final temperature of air is 59.3 Btu.
I think it's B for electrons
Answer:
The specific heat of a substance (per unit of mass) has dimension L. T. Θ−1, or (L/T)2/Θ. Therefore, the SI unit J/K/kg is equivalent to metre squared per second squared per kelvin (m2 K−1 s−2).