How much heat is needed to increase the internal energy of a gas in a piston by 4,736J if the gas does 750J of work on the envir
1 answer:
The heat absorbed by the gas is 5486 J
Explanation:
We can solve this problem by using the 1st law of thermodynamics, which states that the change in internal energy of a gas is given by:
where:
is the change in internal energy
Q is the heat absorbed by the gas
W is the work done by the gas
In this problem, we have:
is the increase in internal energy of the gas
is the work done by the gas (positive because the gas is doing work on the surroundings, by expanding)
Solving for Q, we find the heat needed:
And the positive sign tells us that this heat is absorbed by the gas.
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Answer:
5 ohms
Explanation:
Given:
EMF of the ideal battery (E) = 60 V
Voltage across the terminals of the battery (V) = 40 V
Current across the terminals (I) = 4 A
Let the internal resistance be 'r'.
Now, we know that, the voltage drop in the battery is given as:
Therefore, the voltage across the terminals of the battery is given as:
Now, rewriting in terms of 'r', we get:
Plug in the given values and solve for 'r'. This gives,
Therefore, the internal resistance of the battery is 5 ohms.