Answer:

Explanation:
given data:



Q = - 2.1 Btu


![V_2 = V_1 [\frac{P_1}{P_2}]^{1.1}](https://tex.z-dn.net/?f=V_2%20%3D%20V_1%20%5B%5Cfrac%7BP_1%7D%7BP_2%7D%5D%5E%7B1.1%7D)
![= 1 [\frac{23040}{56160}]^{\frac{1}{1.1}](https://tex.z-dn.net/?f=%3D%20%201%20%5B%5Cfrac%7B23040%7D%7B56160%7D%5D%5E%7B%5Cfrac%7B1%7D%7B1.1%7D)

work done during polytropic process


= -18442.1 ft lbf
we know 1 Btu = 778.169 ft. lbf, therefore
w = -23.6993 Btu



The formula for wave motion is speed of wave equals frequency times wavelength.v = f lambdarearrangingf = v/lambdaf = 0.6/0.02 = 60/2 = 30Hz, or cycles per second.
The correct option is:
<span>chainsaw, diesel truck, rustling leaves
In fact, this option lists the sounds from greatest amplitude (which means, greatest loudness) to smallest amplitude. For comparison, this is the intensity of the three different sounds:
- chain saw: approximately 120 dB
- diesel truck: approximately 80 dB
- rustling leaves: approximately 20 dB
(values taken from this table: </span>https://www.chem.purdue.edu/chemsafety/Training/PPETrain/dblevels.htm )
As per Newton's III law
Every action force that is applied on an object must be equal and opposite to reaction force applied by that object.
It can be said that when we apply any force on an object then this applied force is known as action force and at the same time that object also apply an opposite direction force on us which is known as reaction force having same magnitude.
So as per above theory
Action Force = Reaction Force (magnitude)
while both forces are always opposite in direction
A- plane mirror because its surface is plane