The rates of cooling of two different liquids put in exactly similar calorimeters and kept in identical surroundings are the same if
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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 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 [...]
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 [...]
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 [...]
The earth receives on its surface radiation from the sun at the rate of 1400 W/m^2. The distance of the centre of the sun from the surface of the earth is 1.5 * 10^11 m and the radius of the sun is 7×10^8m. Treating the sun as a black body, it follows from the above data that its surface temperature is
06
Sep
The earth receives on its surface radiation from the sun at the rate of 1400 W/m^2. The distance of the centre of the sun from the surface of the earth is 1.5 * 10^11 m and the radius of the sun is 7×10^8m. Treating the sun as a black body, it follows from the above [...]
A one liter flask contains some mercury. It is found that at different temperatures, then volume of air inside the flask remains the same. What is the volume of mercury in the flask? If co-efficient of linear expansion of glass is = 9 × 10^-6 /C while of volume expansion of mercury is = 1.8 × 10^-4 /C.
06
Sep
A one liter flask contains some mercury. It is found that at different temperatures, then volume of air inside the flask remains the same. What is the volume of mercury in the flask? If co-efficient of linear expansion of glass is = 9 × 10^-6 /C while of volume expansion of mercury is = 1.8 [...]
One end of a copper rod of uniform cross-section and of length 3.1 m is kept in contact with ice and the other end with water at 100 C. At what point along its length should a temperature of 200° C be maintained so that in steady state, the mass of ice melting be equal to that of the steam produced in the same interval of time. Assume that the whole system is insulated from the surroundings. Latent heat of fusion of ice and vaporization of water are 80 cal/gm and 540 cal/gm respectively
06
Sep
One end of a copper rod of uniform cross-section and of length 3.1 m is kept in contact with ice and the other end with water at 100 C. At what point along its length should a temperature of 200° C be maintained so that in steady state, the mass of ice melting be equal [...]
A flask of volume 10^3 cc is completely filled with mercury at 0∘C The coefficient of cubical expansion of mercury is 180 × 10^−6/∘C and heat of glass is 40 × 10^−6/∘C. If the flask in now placed in boiling water at 100∘C how much mercury will overflow?
06
Sep
A flask of volume 10^3 cc is completely filled with mercury at 0∘C The coefficient of cubical expansion of mercury is 180 × 10^−6/∘C and heat of glass is 40 × 10^−6/∘C. If the flask in now placed in boiling water at 100∘C how much mercury will overflow? The rates of cooling of two different [...]