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1 answer:
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Answer:
The correct answer is - option C.
Explanation:
Given:
Two forces on a plank = F1 and F2
mass of plank = m
The distances between these forces and the body of mass m = L1 and L2
we know that,
mg = F1 +F2 ( independent of L1 and L2)
so almost any point the value of the sum that corresponds to static equilibrium is independent of L1 and L2.
Thus, the correct answer is - option C.
Answer:
Its internal energy decreases by 40 J.
Explanation:
The energy supplied to the metal block causes the temperature of the block to rise. Therefore,
Now, we will use this value of mC to find out the energy change of block:
It shows that when the temperature of the metal block falls by 10°C,
<u>Its internal energy decreases by 40 J.</u>