Which of the following words is an example of an interjection?
2 answers:
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Recall that with constant acceleration,
where is the rocket's displacment,
is its initial velocity,
its final velocity, and
is time. So
or just 2100 m if taking significant digits into account.
Answer: 80J
Explanation:
According to the first principle of thermodynamics:
<em>"Energy is not created, nor destroyed, but it is conserved." </em>
Then this priciple (also called Law) relates the work and the transferred heat exchanged in a system through the internal energy , which is neither created nor destroyed, it is only transformed. So, in this especific case of the compressed gas:
(1)
Where:
is the variation in the internal (thermal) energy of the system (the value we want to find)
is the heat transferred out of the gas (that is why it is negative)
is the work is done on the gas (as the gas is compressed, the work done on the gas must be considered positive )
On the other hand, the work done on the gas is given by:
(2)
Where:
is the constant pressure of the gas
is the variation in volume of the gas
In this case the initial volume is and the final volume is
.
This means:
(3)
Substituting (3) in (2):
(4)
(5)
Substituting (5) in (1):
(6)
Finally:
This is the change in thermal energy in the compression process.
Answer: 4.358 kPa
Explanation:
The gas is contained within a rigid container, so the volume of the gas is constant. Therefore, we can use Gay-Lussac's law, which states that:
"for a gas kept at constant volume, the pressure and the absolute temperature are directly proportional"
In formulas:
where:
is the initial pressure
is the initial temperature
is the final pressure
is the final temperature
Substituting the numbers into the equation, we find