Explain the change of phase from liquid to solid in naphthalene by plotting a cooling curve graph.

Study the table given below and answer the following questions

Which substance would heat up fastest and which one slowest?

In a laboratory experiment to measure the specific heat capacity of copper, $0.02 \mathrm{kg}$ of water at $70°\mathrm{C}$was poured into a copper calorimeter with a stirrer of mass $0.16 \mathrm{kg}$, initially at $15°\mathrm{C}$. After stirring, the final temperature reached to $45°\mathrm{C}$. Specific heat capacity of water is taken as $4200 {\mathrm{Jkg}}^{-1}º{\mathrm{C}}^{-1}$. What is the quantity of heat released per $\mathrm{kg}$ of water per $1°\mathrm{C}$ fall in temperature?

For the circuit shown in the diagram below:

What is the value of

(i) current through $6 \mathrm{\Omega }$ resistor?

(ii) the potential difference across the $12 \mathrm{\Omega }$ resistor?

It takes much longer time to boil off $1g$ of water at ${100}^{0}C$ than to heat it from $0^{0}C$ to ${100}^{0}C$. Explain.