Question

Please help, I really need this

Answer 1

9514 1404 393

Answer:

  (a) -- the correct choice is highlighted

Step-by-step explanation:

The units of specific heat tell you what quantities make up the ratio.

  $\dfrac{390\text{ J}}{1\text{ kg \cdot^\circ C}}=\dfrac{-12.0\text{ J}}{0.012\text{ kg}\cdot\Delta T}\\\\\Delta T=\dfrac{-12.0}{0.012\cdot390}\ ^\circ\text{C}\approx-2.56\text{ ^\circ C}$

The temperature will decrease by 2.56 C.