An electric motor converts electrical energy into physical movement. Electric motors generate magnetic fields with electric current through a coil. The magnetic field then causes a force with a magnet that causes movement or spinning that runs the motor.
The answer would be:
<span>It's rate of gaining speed decreases.
The rate at which speed changes is called acceleration,
You can think of this problem as an inclined plane. But the angle of an inclined plane is constantly decreasing.
We know that on a frictionless inclined plane acceleration of an object is:
</span>
![a=gsin(\theta)](https://tex.z-dn.net/?f=a%3Dgsin%28%5Ctheta%29)
<span>Where g is the gravitational acceleration of the Earth and
![\theta](https://tex.z-dn.net/?f=%20%5Ctheta)
is the angle of an inclined plane.
Using our analogy, the ball would start on an inclined plane with a 90-degree angle and that angle would continue to decrease to zero.
The sine function is 1 at 90 degrees and is equal to zero at 0 degrees. Since our acceleration is proportional to the sine, and sine function is decreasing with the angle, our acceleration is also decreasing.
</span>
Answer:
Speed of light in the glass ![v=2.26\times 10^8 ms^{-1}](https://tex.z-dn.net/?f=v%3D2.26%5Ctimes%2010%5E8%20ms%5E%7B-1%7D)
Explanation:
In this question we have given
angle of polaization,p=![53^o](https://tex.z-dn.net/?f=53%5Eo)
we have to find the speed of light in the glass,v=?
We know that, refractive index of glass can be determined by following formula
................(1)
here,
c- speed of light in air
v-speed of light in glass
we also know according to brewester's law refrective index of glass is given as
n=tanp......................(2)
here p-angle of polarization
From equation (1) and equation (2)
we got
![\frac{c}{v}=tanp](https://tex.z-dn.net/?f=%5Cfrac%7Bc%7D%7Bv%7D%3Dtanp)
put value of c=
and p=
in equation 3
we got
![\frac{3\times 10^8 ms^{-1}}{v}=tan53](https://tex.z-dn.net/?f=%5Cfrac%7B3%5Ctimes%2010%5E8%20ms%5E%7B-1%7D%7D%7Bv%7D%3Dtan53)
![v=\frac{3\times 10^8 ms^{-1}}{tan53}\\v=\frac{3\times 10^8 ms^{-1}}{1.32}\\v=2.26\times 10^8 ms^{-1}](https://tex.z-dn.net/?f=v%3D%5Cfrac%7B3%5Ctimes%2010%5E8%20ms%5E%7B-1%7D%7D%7Btan53%7D%5C%5Cv%3D%5Cfrac%7B3%5Ctimes%2010%5E8%20ms%5E%7B-1%7D%7D%7B1.32%7D%5C%5Cv%3D2.26%5Ctimes%2010%5E8%20ms%5E%7B-1%7D)
Answer:
easy
speed = distance/time = 50 / 0.3 = 500/3 m/sec