Heat from burning fuel warms the walls of the firebox section of the furnace in
A. a hot-water heating system.
B. a hot-air heating system.
C. a compressor compartment.
D. an evaporation system.
<span>Heating food under a heat lamp is an example of heat transfer by
<span>Radiation</span></span>
1) In the reference frame of one electron: 0.38c
To find the relative velocity of one electron with respect to the other, we must use the following formula:
![u'=\frac{u-v}{1-\frac{uv}{c^2}}](https://tex.z-dn.net/?f=u%27%3D%5Cfrac%7Bu-v%7D%7B1-%5Cfrac%7Buv%7D%7Bc%5E2%7D%7D)
where
u is the velocity of one electron
v is the velocity of the second electron
c is the speed of light
In this problem:
u = 0.2c
v = -0.2c (since the second electron is moving towards the first one, so in the opposite direction)
Substituting, we find:
![u'=\frac{0.2c+0.2c}{1+\frac{(0.2c)(0.2c)}{c^2}}=\frac{0.4c}{1+0.04}=0.38c](https://tex.z-dn.net/?f=u%27%3D%5Cfrac%7B0.2c%2B0.2c%7D%7B1%2B%5Cfrac%7B%280.2c%29%280.2c%29%7D%7Bc%5E2%7D%7D%3D%5Cfrac%7B0.4c%7D%7B1%2B0.04%7D%3D0.38c)
2) In the reference frame of the laboratory: -0.2c and +0.2c
In this case, there is no calculation to be done. In fact, we are already given the speed of the two electrons; we are also told that they travel in opposite direction, so their velocities are
+0.2c
-0.2c
Meters it the SI unit for measuring length.
As it is given that Bulk modulus and density related to velocity of sound
![v = \sqrt{\frac{B}{\rho}}](https://tex.z-dn.net/?f=v%20%3D%20%5Csqrt%7B%5Cfrac%7BB%7D%7B%5Crho%7D%7D)
by rearranging the equation we can say
![B = \rho * v^2](https://tex.z-dn.net/?f=B%20%3D%20%5Crho%20%2A%20v%5E2)
now we need to find the SI unit of Bulk modulus here
we can find it by plug in the units of density and speed here
![B = \frac{kg}{m^3} * (\frac{m}{s})^2](https://tex.z-dn.net/?f=B%20%3D%20%5Cfrac%7Bkg%7D%7Bm%5E3%7D%20%2A%20%28%5Cfrac%7Bm%7D%7Bs%7D%29%5E2)
so SI unit will be
![B = \frac{kg}{m* s^2}](https://tex.z-dn.net/?f=B%20%3D%20%5Cfrac%7Bkg%7D%7Bm%2A%20s%5E2%7D)
SO above is the SI unit of bulk Modulus