Explain Newton's law of cooling.

Important Questions on Thermal Properties of Matter

MEDIUM

11th Maharashtra Board

IMPORTANT

Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 2

What is thermal stress? Give an example of disadvantages of thermal stress in practical use?

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 2

Which materials can be used as thermal insulators and why?

MEDIUM

11th Maharashtra Board

IMPORTANT

Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 3

A glass flask has volume $1\times {10}^{-4}{m}^3$ • It is filled with a liquid at $30°C$. If the temperature of the system is raised to $100°C$, how much of the liquid will overflow. (Coefficient of volume expansion of glass is $1.2\times {10}^{-5} (°C{)}^{-1}$ while that of the liquid is $75\times {10}^{-5} (°C{)}^{-1}$

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 3

Which will require more energy, heating a $2.0kg$ block of lead by $30K$ or heating a $4.0kg$ block of copper by $5K$? ($s_{lead}=128 \raisebox{1ex}{$J$}\!\left/ \!\raisebox{-1ex}{$Kg·K, s_{copper}=387 {\displaystyle \raisebox{1ex}{$J$}\!\left/ \!\raisebox{-1ex}{$Kg·K$}\right.}$}\right.$)

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 3

Specific latent heat of vaporization of water is $2.26\times {10}^6 \raisebox{1ex}{$J$}\!\left/ \!\raisebox{-1ex}{$Kg$}\right.$. Calculate the energy needed to change $5.0g$ of water into steam at $100°C$

MEDIUM

11th Maharashtra Board

IMPORTANT

Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 3

A metal sphere cools at a rate of $0.05 \raisebox{1ex}{$°C$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$ when its temperature is $70°C$ and at the rate of $0.025 \raisebox{1ex}{$°C$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$ when its temperature is $50°C$. Determine the temperature of the surroundings and find the rate of cooling when the temperature of the metal sphere is $40°C$

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 3

The volume of a gas varied linearly with absolute temperature if its pressure is held constant. Suppose the gas does not liquify even at very low temperatures, at what temperature the volume of the gas will be ideally zero?

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 3

Which materials can be used as thermal insulators and why?