Physics

Problem

A copper block is removed from a furnace at

150\,^{\circ}\text{C}

and immediately placed into

0.300\,\text{kg}

of water at

25\,^{\circ}\text{C}

in an insulated container. After stirring, the water’s temperature rises to

35\,^{\circ}\text{C}

. Assuming

5.0\%

of the thermal energy released by the copper is lost to the surroundings and no phase changes occur, determine the mass of the copper block. (Specific heats: water

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

, copper

386\,\text{J}\,\text{kg}^{-1}\,^{\circ}\text{C}^{-1}

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