Physics - Heat & Thermo Question with Solution | TestHub

A beaker is fitted with a heating coil and stirrer and contains $40.0{\mathrm{cm}}^3$ of liquid A. When the power dissipated in the heating coil is 4.80 W, the temperature of the contents rises from 15.0°C to 35.0°C in 400 s. The experiment is repeated using $20.0{\mathrm{cm}}^3$ of liquid A mixed with $20.0{\mathrm{cm}}^3$ of liquid B. It is found that, with a heater power of 4.90 W , the temperature again rises from $15.0^{\circ }\mathrm{C}$ to $35.0^{\circ }\mathrm{C}$ in 400 s. The specific heat capacity of liquid B (in $\mathrm{J}\mathrm{k}{\mathrm{g}}^{-1}{\mathrm{K}}^{-1}$) is: (Density of A is $1.60\times 10^3\mathrm{kg}{\mathrm{m}}^{-3}$, Specific heat capacity of A is $8.60\times 10^2\mathrm{J}\mathrm{k}{\mathrm{g}}^{-1}{\mathrm{K}}^{-1}$, Density of B is $2\times 10^3\mathrm{kg}{\mathrm{m}}^{-3}$ )