Answer:

Explanation:

Cross multiply


cross multiply

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Answer:
Explanation:
Given
Two block are connected by rope 
rope is attached to block 2
suppose
is a force applied to Rope
Applied force
=Tension in Rope 2

where a=acceleration of system
Tension in rope
is denoted by 

divide 1 and 2 we get

also 



Answer:
A. the internal energy stays the same
Explanation:
From the first law of thermodynamics, "energy can neither be created nor destroyed but can be transformed from one form to another.
Based on this first law of thermodynamic, the new internal energy of the gas is the same as the internal energy of the original system.
Therefore, when the partition separating the two halves of the box is removed and the system reaches equilibrium again, the internal energy stays the same.