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Explain the working of a refrigerator
A refrigerator is the reverse of a heat engine. Here the working substance extracts heat Q2 from the cold reservoir at temperature T2, some external work W is done on it and heat Q1 is released to the hot reservoir at temperature T1.
In a refrigerator the working substance (usually, in gaseous form) goes by the following steps:
(a) Sudden expansion of the gas from high to low pressure which cools it and changes it into a vapour-liquid mixture,
(b) Absorption by the cold fluid of heat from the region to be cooled changing it into vapour.
(c) Heating up of the vapour because of external work done on the system, and
(d) Release of heat by the vapour to the surroundings, bringing it to the initial state and completing the cycle.
a) You are travelling in a rocket in a totally vacant universe. The rocket is travelling at 100 m.s -1 and accelerates at 10g for 3 minutes. How fast are you travelling at th
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dimension of units
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Muturi is rearranging some furniture. He pushes the dresser with a force of 143 N,and there is opposing frictional force of 112 N. What is the net force ?
why long jump run certain distance before running??
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Truck has a 100 kW engine power and 40 % efficiency . As oil burn in an hour if q = 4.4 to force multiplication 10 to 7 ?
(i)Cathode waves always travel in straight path. (ii) Cathode rays exert mechanical force on the objects they strike. (iii) Cathode rays make fluorescence. (iv)
If the particles of a medium vibrate in the direction of wave motion the wave is known as longitudinal. a) It goes in the form of compression and rarefaction. b) A
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