E=Q2/τ e= 120/30
e=4 (eficiência da máquina frigorífica)

Exercício para entregar: Numa máquina frigorífica são retirados 240 J do congelador( fonte fria). No processo, a atmosfera ( fonte quente) recebe 300 J. Calcule o trabalho do compressor e a eficiência dessa máquina térmica.

when cloud cover increases then the suns ray's which provides the earth with light and warmth gets covered due to the due to the suns ray's being blocked, the temperature in that region

therefore to conclude i would like to say that,

=more the cloud cover, the lesser the

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i think the answer is a and b

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