Physics

Problem

0.250\,\text{kg}

block of aluminum at

150^{\circ}\text{C}

is quickly placed into

0.400\,\text{kg}

of water at

25^{\circ}\text{C}

in a perfectly insulated container. The specific heats are

c_{\text{Al}}=900\,\text{J}\,\text{kg}^{-1}\,^{\circ}\text{C}^{-1}

and

c_{\text{w}}=4186\,\text{J}\,\text{kg}^{-1}\,^{\circ}\text{C}^{-1}

. What is the final equilibrium temperature of the system? a)

47^{\circ}\text{C}

40^{\circ}\text{C}

31^{\circ}\text{C}

73^{\circ}\text{C}