Thermal Propert...

In cold countries, water pipes sometimes burst, because

Wires A and B have identical lengths and have circular cross-sections. The radius of A is twice the radius of B i.e. $$r_A=2r_B$$. For a given temperature difference between the two ends, both wires conduct heat at the same rate. The relation between the thermal conductivities is given by :

The length of the two rods made up of the same metal and having the same area of the cross-section are $$0.6$$ m and $$0.8$$ m respectively. The temperature between the ends of the first rod is $$90 ^\circ C$$ and $$60 ^\circ C$$ and that for the other rod is $$150$$ and $$110 ^\circ C$$. For which rod the rate of conduction will be greater

The coefficients of thermal conductivity of copper, mercury, and glass are respectively K, K, and K such that $$K > K > K$$. If the same quantity of heat is to flow per second per unit area of each and corresponding temperature gradients are X, X, and X, then 

One likes to sit under sunshine in the winter season, because

Calorimeters are made of which of the following

The layers of the atmosphere are heated through 

Two rods of the same length and cross-section are joined along the length. Thermal conductivities of the first and second rod are $$K_1$$ and $$K_2$$. The temperature of the free ends of the first and second rods are maintained at $$\theta_1$$ and $$\theta_2$$ respectively. The temperature of the common junction is :

A body of length $$1m$$ having a cross-sectional area $$0.75m^2$$ has heat flow through it at the rate of $$6000 \ Joule/sec$$. Then find the temperature difference if $$K=200Jm^{-1}K^{-1}$$

Two cylinders P and Q have the same length and diameter and are made of different materials having thermal conductivities in the ratio $$2: 3$$. These two cylinders are combined to make a cylinder. One end of P is kept at $$100 ^\circ C$$ and another end of Q at $$0 ^\circ C$$. The temperature at the interface of P and Q is