During compression of a spring the work done is $10 kJ$ and $2 kJ$ escaped to the surroundings as heat. The change in internal energy, $Δ U$ (in $kJ$ ) is:

8

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Solution

The correct option is A $8$
In the given system, during the compression of a spring the workdone is $10 kJ$ and $2 kJ$ of heat is escaped to the surroundings. So, $q = - 2 kJ$ and $W = 10 kJ$ . According to the first law of thermodynamics, $Δ U = q + W = - 2 kJ + 10 kJ$
$Δ U = 8 kJ$ .
The change in internal energy, $Δ U = 8 kJ$ .

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During compression of a spring the work done is 10 kJ and 2 kJ escaped to the surroundings as heat. The change in internal energy, ΔU (in kJ) is:

The correct option is A 8 In the given system, during the compression of a spring the workdone is 10 kJ and 2 kJ of heat is escaped to the surroundings. So, q=−2 kJ and W=10 kJ. According to the first law of thermodynamics, ΔU=q+W=−2 kJ+10 kJ ΔU=8 kJ. The change in internal energy, ΔU=8kJ.

During compression of a spring the work done is $10 kJ$ and $2 kJ$ escaped to the surroundings as heat. The change in internal energy, $Δ U$ (in $kJ$ ) is: