Which physical law underlies the first law of thermodynamics?
1 answer:
Answer:
Conservation of energy
Explanation:
The first law of thermodynamics is given by :
Here,
Q is amount of heat added to the system
is change in internal energy
W is amount of work done by the system
It is clear that the energy can be neither created nor destroyed, it remains conserved. Hence, first law of thermodynamics shows that conservation of energy.
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Answer:
the new gravitational force between the two masses is of the original force (third option in the provided list)
Explanation:
Recall the expression for gravitational force : , where
and
are the point masses, d the distance between them, and G the universal gravitational constant.
I our problem, the distant between the particles stays unchanged, and we need to know what happens with the magnitude of the force as mass A is tripled, and mass B is halved.
Initial force expression:
Final force expression:
Where we have recognized the expression for the initial force between the particles, and replaced it with to make the new relation obvious.
Therefore, the new gravitational force between the two masses is of the original force.