I feel like the answer might be
The car with a mass of 8 kg
So the formula for density is mass divided by volume, so it would be
How dense the medium is in the compression part of the wave and how rare the medium is in the rarefaction part of the wave is a measure of the longitudinal wave's amplitude.
Answer:
a) 2250 J
b) 0 J
c) 2250 J
Explanation:
a) Since, the process is isochoric
the change in internal energy
![\Delta U = n C_v(T_f-T_i)](https://tex.z-dn.net/?f=%5CDelta%20U%20%3D%20n%20C_v%28T_f-T_i%29)
Here, n = 0.2 moles
Cv = 12.5 J/mole.K
We have to find T_f so we can use gas equation as
![\frac{P_1V_1}{P_2V_2} =\frac{T_i}{T_f}\\Since, V_1=V_2 [isochoric/process]\\\Rightarrow \frac{P_{atm}}{4P_{atm}} = \frac{300}{T_f} \\\Rightarrow T_f = 1200 K](https://tex.z-dn.net/?f=%5Cfrac%7BP_1V_1%7D%7BP_2V_2%7D%20%3D%5Cfrac%7BT_i%7D%7BT_f%7D%5C%5CSince%2C%20V_1%3DV_2%20%20%20%20%5Bisochoric%2Fprocess%5D%5C%5C%5CRightarrow%20%5Cfrac%7BP_%7Batm%7D%7D%7B4P_%7Batm%7D%7D%20%3D%20%5Cfrac%7B300%7D%7BT_f%7D%20%5C%5C%5CRightarrow%20T_f%20%3D%201200%20K)
So, ![\Delta U= 0.2\times12.5(1200-300)\\=2250 J](https://tex.z-dn.net/?f=%5CDelta%20U%3D%200.2%5Ctimes12.5%281200-300%29%5C%5C%3D2250%20J)
b) Since, the process is isochoric no work shall be done.
c) By first law of thermodynamics we have
![\Delta U = Q-W\\Since, W = 0\\\Delta U = Q\\Therefore, Q = 2250 J](https://tex.z-dn.net/?f=%5CDelta%20U%20%3D%20Q-W%5C%5CSince%2C%20W%20%3D%200%5C%5C%5CDelta%20U%20%3D%20Q%5C%5CTherefore%2C%20Q%20%3D%202250%20J)
Since, Q is positive 2250 J of heat will flow into the system.
The resultant of the forces is 29 N. Option D
<h3>What is the resultant force?</h3>
The resultant force is the force that acts in a given direction. Now we have two forces as enumerated in the question.
Thus;
Resultant = √(10)^2 + (20)^2 - [2 * 10 * 20 * cos (60 - 30))
Resultant = 29 N
Thus, the resultant of the forces is 29 N.
Learn more about resultant force:brainly.com/question/16380983
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Missing parts;
Two forces of magnitude 10N and 20N act on a body in directions making angles 30° and 60° respectively with x-axis what is the resultant force
A.17N
B. 19N
C. 23N
D. 29N
E. 37N