Two rods A and B are of equal length each rod has its end at temperature `T_1 ` and `T_2` what is the condition that will erasure equal rates of flow of heat through the rods A and B?

Two similar wires of equal lengths having diameters in the ratio of 1:2 are joined in series. Compare the amounts of heat produced in the wires if a stedy current flows through them.

Two rods 1 and 2 of same length have same temperature difference between their ends. Their thermal conductivities are K_1 and K_2 , and cross sectional areas A_1 and A_2 respectively. What is the required condition for the same rate of heat conduction in them ?

If for two gases of molecular weight M_A and M_B at temperature T_A and T_B, T_AM_B = T_BM_A , then which property has the same magnitude for both the gases :

A rod A and a rod B of different materials differ in length by 5 cm at all temperatures . What are their lengths at 0^@C if the coefficients of linear expansion of A and B are 12 xx 10^(-6)//^@C and 18 xx 10^(-6)//^@C respectively ?

A pond is covered by a sheet of ice 2.0 cm thick (thermal conductivity 1.6 jm^(-1)s^(-1)k^(-1) . The temperature of the lower surface of ice is 0^@ C and that of the upper surface is -10^@ C . At what rate is heat conducted through each square meter of the ice ? What is the direction of this flow of energy ?

There are two wires of the same material . Their radius and length are in the ratio 1:2 If the extension produced are equal, what is the ratio of the loads

Assume that each born child is equally likely to be a boy or a girl. If a family has two children, then what is the conditional probability that both are girls, given that atleast one is a girl?