A piece of copper at is dropped into a mass of water at contained in an insulated vessel

PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

0.200\,\text{kg}

piece of copper at

90^{\circ}\text{C}

is dropped into a mass

m_{\text{w}}

of water at

15^{\circ}\text{C}

contained in an insulated vessel. If the final equilibrium temperature is

25^{\circ}\text{C}

, what is

m_{\text{w}}

? (Specific heats:

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

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

.) (a)

240\,\text{g}

(b)

120\,\text{g}

(c)

60\,\text{g}

(d)

280\,\text{g}