Suppose a system of two particles, represented by circles, have the possibility of occupying energy states with 0, 10, or 20 J.
1 answer:
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Answer : The final temperature of the mixture is,
Explanation :
First we have to calculate the mass of ethanol and water.
and,
Now we have to calculate the final temperature of the mixture.
In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.
where,
= specific heat of ethanol =
= specific heat of water =
= mass of ethanol = 35.5 g
= mass of water = 45.0 g
= final temperature of mixture = ?
= initial temperature of ethanol =
= initial temperature of water =
Now put all the given values in the above formula, we get:
Therefore, the final temperature of the mixture is,
Explanation:
Formula to calculate work done by motor is as follows.
Work done by motor =
where, g = gravitational constant = 10
Therefore, work done by motor is as follows.
Work done by motor =
= 100.0 J
Now, heat lost by water will be calculated as follows.
q =
=
= 10.0 J
Hence, heat gained by motor = heat lost by water
As, heat gained by motor = 10.0 J
So, change in energy = heat gained - work done
Therefore, change in energy will be calculated as follows.
Change in energy = heat gained - work done
= (10.0 J) - (100.0 J)
= -90.0 J
Thus, we can conclude that change in the energy of the battery contents is -90.0 J.