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The speed of a 50 kg heavenly object red...

The speed of a 50 kg heavenly object reduces from `30 km cdot "min"^(-1)` to `10 km cdot "min"^(-1)` due to its passage through earth's atmosphere. Find out the heat generated in calorie, due to this change in speed. `J = 4.2 xx 10^(7) erg`.

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The correct Answer is:
`13.23 xx 10^(5) cal`
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The velocity of a 42 kg celestial body reduces from 20 km cdot "min"^(-1) to 5 km cdot "min"^(-1) due to its passage through the earth's atmosphere. Find out the heat produced in calorie. (J = 4.2 xx 10^(7) erg cdot cal^(-1))

Two bodies, each having a mass of 3kg, collide with each other. One body was at rest and the other was moving with a 4 m cdot s^(-1) velocity. After collision they combine with each other. Find out the heat produced as a result of this collision. Mechanical equivalent of heat = 4.2 J cdot cal^(-1) .

A lead bullet stopped on hitting an iron plate at a velocity of 300 m cdot s^(-1) . Find out the rise in temperature of the bullet, if the heat evolved is shared equally between the bullet and the plate. Given, J = 4 cdot 2 xx 10^(7) erg cdot cal^(-1) , specific heat of lead = 0.03 cal cdot g^(-1) cdot^(@)C^(-1) .

Specific heat of argon at constant pressure and at constant volume are 0.12 cal cdot g^(-1) cdot^(@)C^(-1) and 0.08 cal cdot g^(-1) cdot^(@)C^(-1) respectively. Find out the density of argon at STP. J = 4.2 xx 10^(7) erg cdot cal^(-1) , standard pressure = 1.01 xx 10^(6) dyn cdot cm^(-2) .

Sea water is splattered horizontally from a jet at a speed of 10 m cdot s^(-1) . The water comes to rest after falling in a container, 20 m below the jet level. What will be the increase in the temperature of the water? Specific heat of sea water = 0.94 cal cdot g^(-1) cdot^(@)C^(-1), J = 4.2 xx 10^(7) erg cdot cal^(-1) .

A piece of ice at 0^(@)C is dropped to the ground from some height. The piece of ice melts completely due to its impact with the ground. Find the height from which the piece was dropped considering that 60% of its energy is converted into heat. (J = 4.2 J cdot cal^(-1))

The volume of 1 g of water (1 cm^3) becomes 1671 cm^(3) on being converted to steam at standard atmosphere pressure. Find out the work done and rise in internal energy. Given, latent heat of vaporisation of water = 540 cal cdot g^(-1) , the standard atmosphere pressure = 1.013 xx 10^(5) N cdot m^(-2) .

Water drops from a height of 50 m in a waterfall. Find out the rise in temperature of water, if 75% of its energy is converted into heat and absorbed by water. (J = 4.2 xx 10^(7) erg cdot cal^(-1) , g = 9.8 m cdot s^(-2))

The mechanical equivalent of heat is 4.2 xx 10^(7) erg cdot cal^(-1) . What does it mean?

What is the amount of work done to convert 40 g of ice at -10^(@)C into steam at 100^(@)C ? Specific heat of ice = 0.5 cal cdot g^(-1) cdot ^(@)C^(-1) , latent heat of fusion of ice =80 cal cdot g^(-1) , latent heat of steam = 540 cal cdot g^(-1), J = 4.2 xx 10^(7) erg cdot cal^(-1) .

CHHAYA PUBLICATION-FIRST AND SECOND LAW OF THERMODYNAMICS-Exercise - Problem Set - II (Marks 3 or 4)
  1. The mean velocity of raindrops is 20 m cdot s^(-1) . When these drops ...

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  2. A hole is made in a piece of iron of mass 200 g with the help of a 186...

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  3. The speed of a 50 kg heavenly object reduces from 30 km cdot "min"^(-1...

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  4. Sea water is splattered horizontally from a jet at a speed of 10 m cdo...

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  5. Find out the minimum height from which a piece of ice at 0^(@)C should...

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  6. A lead bullet melts on hitting a fixed target. What will be the minimu...

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  7. A certain volume of a gas expands at one standard atmosphere pressure ...

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  8. The volume of 1 mol of a gas is doubled when it expands isothermally a...

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  9. 70 cal of heat is required to increase the temperature of 2 mol of an ...

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  10. What will be the change in internal energy of 128 g of oxygen gas at c...

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  11. What will be the increase in temperature if dry air at 27^(@)C is comp...

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  12. The tyre of a motorcar bursts suddenly when air was being pumped in it...

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  13. Calculate the amount of work done, if 20 g of hydrogen gas is compress...

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  14. Some amount of gas at 27^(@)C is suddenly compressed to 27 times its ...

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  15. In an adiabatic process where pressure is increased by 2/3%, if (Cp)/(...

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  16. The volume of air increases by 2% in its adiabatic expansion. Calculat...

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  17. Air at 27^(@)C and 128 atm pressure is filled in a container in resear...

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  18. Equal volume of mono atomic and diatomic gases of same initial tempera...

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  19. A steam engine delivers 5.4 xx 10^(8)J of work per minute and services...

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  20. A reversible heat engine converts 1/6 th of heat, which it extracts fr...

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