Chapter 13 – Thermal Expansion, Calorimetry and Transmission of Heat
Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 13 - Thermal Expansion, Calorimetry and Transmission of Heat
5 g of water at 30∘C and 5g of ice at −20∘ C are mixed together in a calorimeter. What is the final temperature of the mixture. Given specific heat of ice = 0.5 cal g −1∘ C −1 and latent heat of fusion of ice = 80 cal g −1.
06
Sep
5 g of water at 30∘C and 5g of ice at −20∘ C are mixed together in a calorimeter. What is the final temperature of the mixture. Given specific heat of ice = 0.5 cal g −1∘ C −1 and latent heat of fusion of ice = 80 cal g −1. The rates of cooling [...]
A body cools from 50°C to 49°C in 5 seconds. How long will it take to cool from 40°C to 39°C? (Assume temperature of surrounding to be 30°C and Newton’s law of cooling is valid).
06
Sep
A body cools from 50°C to 49°C in 5 seconds. How long will it take to cool from 40°C to 39°C? (Assume temperature of surrounding to be 30°C and Newton’s law of cooling is valid). A body cools from 50°C to 49°C in 5 seconds. How long will it take to cool from 40°C to [...]
A room at 20 C is heated by a heater of resistance 20 ohm connected to 200 V mains. The temperature is uniform throughout the room and the heat is transmitted through a glass window of area 1m^2 and thickness 0.2 cm. Calculate the temperature outside. Thermal conductivity of glass is 0.2 cal/mC s and mechanical equivalent of heat is 4.2 J/cal.
06
Sep
A room at 20 C is heated by a heater of resistance 20 ohm connected to 200 V mains. The temperature is uniform throughout the room and the heat is transmitted through a glass window of area 1m^2 and thickness 0.2 cm. Calculate the temperature outside. Thermal conductivity of glass is 0.2 cal/mC s and [...]
An earthen pitcher loses 1 g of water per minute due to evaporation. If the water equivalent of pitcher is 0.5 kg and the pitcher contains 9.5 kg of water, calculate the time required for the water in the pitcher to cool to 28C from its original temperature of 30C. Neglect radiation effect. Latent heat of vapourization of water in this range of temperature is 580 cal/g and specific heat of water is 1 kcal/gC
06
Sep
An earthen pitcher loses 1 g of water per minute due to evaporation. If the water equivalent of pitcher is 0.5 kg and the pitcher contains 9.5 kg of water, calculate the time required for the water in the pitcher to cool to 28C from its original temperature of 30C. Neglect radiation effect. Latent heat [...]
Two hollow spheres of different materials, one with double the radius and one-fourth wall thickness of the other, are filled with ice. If the times taken for complete melting of ice in the large to the smaller one are in the ratio of 25::16, then their corresponding thermal conductivities are in the ratio
06
Sep
Two hollow spheres of different materials, one with double the radius and one-fourth wall thickness of the other, are filled with ice. If the times taken for complete melting of ice in the large to the smaller one are in the ratio of 25::16, then their corresponding thermal conductivities are in the ratio are filled [...]
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are filled with ice. If the times taken for complete melting of ice in the large to the smaller one are in the ratio of 25::16 ,
one with double the radius and one-fourth wall thickness of the other ,
then their corresponding thermal conductivities are in the ratio ,
Two hollow spheres of different materials ,
The temperature across two different slabs A and B are shown in the steady state (as shown Fig) The ratio of thermal conductivities of A and B is
06
Sep
The temperature across two different slabs A and B are shown in the steady state (as shown Fig) The ratio of thermal conductivities of A and B is The temperature across two different slabs A and B are shown in the steady state (as shown Fig) The ratio of thermal conductivities of A and B [...]
A vessel contains M grams of water at a certain temperature and water at a certain other temperatures is passed into it at a constant rate of m g/s. The variation of temperature of the mixture with time is shown in Fig. 1.90. The values of M and m are, respectively (the heat exchanged after a long time is 800 cal)
06
Sep
A vessel contains M grams of water at a certain temperature and water at a certain other temperatures is passed into it at a constant rate of m g/s. The variation of temperature of the mixture with time is shown in Fig. 1.90. The values of M and m are, respectively (the heat exchanged after [...]
Two plates identical in size, one of black and rough surface (B_1) and the other smooth and polished (A_2) are interconnected by a thin horizontal pipe with a mercury pellet at the centre. Two more plates A_1 (identical to A_2 ) and B_2 (identical to B_1) are heated to the same temperature and placed closed to the plates B_1, and A_2 as shown in the diagram. The Mercury pellet
06
Sep
Two plates identical in size, one of black and rough surface (B_1) and the other smooth and polished (A_2) are interconnected by a thin horizontal pipe with a mercury pellet at the centre. Two more plates A_1 (identical to A_2 ) and B_2 (identical to B_1) are heated to the same temperature and placed closed [...]
A kettle with 2 litre water at 27C is heated by operating coil heater of power 1 kW. The heat is lost to the atmosphere at constant rate 160 J/s, when its lid is open. In how much time will water heated to 77C with the lid open ? (specific heat of water = 4.2 kJ/C-kg)
06
Sep
A kettle with 2 litre water at 27C is heated by operating coil heater of power 1 kW. The heat is lost to the atmosphere at constant rate 160 J/s, when its lid is open. In how much time will water heated to 77C with the lid open ? (specific heat of water = 4.2 [...]
An electrically heated coil is immersed in a calorimeter containing 360 g of water at 10C. The coil consumes energy at the rate of 90 W. The water equivalent of calorimeter and coil is 40 g. The temperature of water after 10 min is
06
Sep
An electrically heated coil is immersed in a calorimeter containing 360 g of water at 10C. The coil consumes energy at the rate of 90 W. The water equivalent of calorimeter and coil is 40 g. The temperature of water after 10 min is The rates of cooling of two different liquids put in exactly [...]