Thermal Propert...

A metal ball immersed in alcohol weighs W₁ at 0°C and W₂ at 59°C. The coefficient of cubical expansion of the metal is less than that of alcohol. Assuming that the density of metal is large compared to that of alcohol, it can be shown that

The coefficient of volumetric expansion of mercury is 18 × 10^–5/°C. A thermometer bulb has a volume 10^–6 m³ and cross-section of stem is 0.004 cm². Assuming that bulb is filled with mercury at 0°C then the length of the mercury column at 100°C is

A piece of metal weighs 46 g in air. When it is immersed in the liquid of specific gravity 1.24 at 27°C it weighs 30 g. When the temperature of liquid is raised to 42°C the metal piece weighs 30.5 g, specific gravity of the liquid at 42°C is 1.20, then the linear expansion of the metal will be

A substance of mass m kg requires a power input of P watts to remain in the molten state at its melting point. When the power is turned off, the sample completely solidifies in time t sec. What is the latent heat of fusion of the substance?

Steam at 100°C is passed into 1.1 kg of water contained in a calorimeter of water equivalent to 0.02 kg at 15°C till the temperature of the calorimeter and its contents rises to 80°C. The mass of the steam condensed in kg is

A lead bullet at 27°C just melts when stopped by an obstacle. Assuming that 25% of heat is absorbed by the obstacle, then the velocity of the bullet at the time of striking (M.P. of lead = 327°C, specific heat of lead = 0.03 cal/g°C, latent heat of fusion of lead = 6 cal/g and J = 4.2 J/cal)

The temperature of equal masses of three different liquids A, B and C are 12°C, 19°C and 28°C respectively. The temperature when A and B are mixed is 16°C and when B and C are mixed is 23°C. The temperature when A and C are mixed is

In an industrial process 10 kg of water per hour is to be heated from 20°C to 80°C. To do this steam at 150°C is passed from a boiler into a copper coil immersed in water. The steam condenses in the coil and is returned to the boiler as water at 90^oC. How many kg of steam is required per hour. (Specific heat of steam = 1 calorie per g^oC, Latent heat of vapourisation = 540 cal/g)

The coefficient of linear expansion of crystal in one direction is α₁ and that in every direction perpendicular to it is α₂. The coefficient of cubical expansion is

Three rods of equal length I are joined to form an equilateral triangle PQR. 0 is the mid point of PQ. Distance OR remains same for small change in temperature. Coefficient of linear expansion for PR and RQ is same, i.e.,α₂ but that for PQ is α₁. Then