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प्रश्न
Fill in the following blank using suitable word:
Whenever mechanical work is done, .......... Is produced.
उत्तर
Whenever mechanical work is done, heat Is produced.
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संबंधित प्रश्न
How much steam at 100oC must be passed into 120 g of water at 20oC to raise the temperature to 40oC?
Give scientific reasons for the following:
Sand mixed with salt is often spread over the icy roads in winter.
1 kg of molten lead at its melting point of 327°C is dropped into 1 kg of water at 20°C. Assuming no loss of heat, calculate the final temp. of water. (Sp. heat of lead = 130 J/kg°C, latent heat of lead = 27000 J/kg and Sp. heat of water = 4200 J/kg°C).
What mass of ice at 0°C will be required to cool 0.9 kg of water from 35°C to 0°C? Assume all the ice used melts. The specific heat capacity of water is 4.2 x 103 J/kgoC and specific latent heat of fusion of ice is 336 x 103 J/kg.
Which requires more heat: 1 g ice at 0°C or 1 g water at 0°C to raise its temperature to 10°C? Explain your answer.
1 kg of ice at 0o is heated at constant rate and its temperature is recorded after every 30 s till steam is formed at 100o C. Draw a temperature time graph to represent the change of phase.
1 kg of steam condenses to water at 100°C. How many joules of heat energy is liberated?
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