Thermal Propert...

Two metallic sphere $$S_1$$ and $$S_2$$ are made of the same material and have got identical surface finish.The mass of $$S_1$$ is thrice that of $$S_2$$.Both the sphere are heated to the same high temperature and placed in the same room having lower temperature but are thermally insulated from each other.The ratio of the initial rate of cooling of $$S_1$$ to that $$S_2$$ is :

The pressure of an ideal gas veries according to the law $$P=P_{0}-AV^{2}$$ where $$P_{0}$$ and A are positive constants. What is the highest temperature that can be attained by the gas?

Consider the situation as shown in fig. Calculate the amount of heat flowing per second through a cross section of the bent part, if the total heat taken out per second from the end at $$100^{o}C$$ is $$130\ J$$. 

$$10g$$ of ice at $$-{20}^{o}C$$ is added to $$10g$$ of water at $${50}^{o}C$$. Specific heat of water $$=1cal/g ^{o}C$$, specific heat of ice$$=0.5cal/g^{o}C$$. Latent heat of ice $$=80cal/g$$. Then resulting temperature is -

A hot body is placed in cooler surrounding. When the hot body temperature $$75^{\circ}C$$, the rate of cooling is $$4^{\circ}C/min$$. When it is $$55^{\circ}C$$, the rate of cooling is $$2^{\circ}C/min$$. The temperature of the surroundings is

Two closed containers of equal volume filled with air at pressure $$P_{0}$$ and temperature $$T_{0}$$. Both are connected by  narrow tube. If one of the container is maintained at temperature $$T_{0}$$ and another at temperature T, then new pressure in the containers will be 

Compare rate of radiation of metal sphere at $$627^0C$$ annd $$ 327^0C$$.

In the given figure, if the heat flowing through the $$5 \Omega$$ resistance is 10 calorie then how much heat is flowing through the $$4\Omega $$ resistance ?

Two rods with the same dimensions have thermal conductivity in the ratio $$1:\ 2$$. They are arranged between heat reservoirs with the same temperature difference, in two different configurations, in two different configurations. $$A\ and\  B$$. The rates of heat flow in $$A\  and\ B$$ are $$I_{A}\ and\ I_{B}$$ respectively. The ratio $$\dfrac{I_{A}}{I_{B}}$$ is equal to 

Two bodies $$A$$ and $$B$$ having equal surface areas are maintained at temperatures $$10 ^ { \circ } \mathrm { C }$$ and $$20 ^ { \circ } \mathrm { C }$$. The thermal radiation emitted in a given time by $$A$$ and $$B$$ are in the ratio