Physics

Problem

Two identical

100\,\text{g}

metal blocks start at

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

. Metal X has a specific heat capacity of

0.25\,\text{J}\,\text{g}^{-1}\,^{\circ}\!\text{C}^{-1}

, and metal Y has a specific heat capacity of

0.50\,\text{J}\,\text{g}^{-1}\,^{\circ}\!\text{C}^{-1}

. Each block is heated by its own electric coil that supplies a constant

40\,\text{J}\,\text{s}^{-1}

. At the instant metal Y reaches

75\,^{\circ}\!\text{C}

, what is the temperature of metal X? a)

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

125\,^{\circ}\!\text{C}

100\,^{\circ}\!\text{C}

75\,^{\circ}\!\text{C}