What happens when light enters a polarizing filter
1 answer:
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1) Forces acting on your body: force of gravity and normal reaction
2) Due to Newton's second law, N = mg
Explanation:
1)
When you sit on the computer, there are only two forces acting on you:
- The force of gravity, acting downward, of magnitude
, where m is your mass and
is the acceleration due to gravity, downward
- The normal reaction exerted by the chair on you,
, acting upward
Your body is in equilibrium (it doesn't move), this means that the two forces balance each other, therefore:
2)
We can now apply Newton's second law of motion to this situation; this law states that the net force acting on a body is equal to the product between its mass and its acceleration. Mathematically,
where
is the net force
m is the mass
a is the acceleration
In this situation, the net force is
So the equation becomes
However, we observe that your body is at rest; therefore, the acceleration is zero:
a = 0
And therefore,
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Answer:
a) The tangential component of acceleration at the edge of the motor at is -1.075 meters per square second.
b) The electric motor will take approximately 3.963 seconds to decrease its angular velocity by 75 %.
Explanation:
The angular aceleration of the electric motor (), measured in radians per square second, as a function of time (
), measured in seconds, is determined by the following formula:
(1)
The function for the angular velocity of the electric motor (), measured in radians per second, is found by integration:
(2)
Where is the initial angular velocity, measured in radians per second.
a) The tangential component of aceleration (), measured in meters per square second, is defined by the following formula:
(3)
Where is the radius of the electric motor, measured in meters.
If we know that ,
and
, then the tangential component of the acceleration at the edge of the motor is:
The tangential component of acceleration at the edge of the motor at is -1.075 meters per square second.
b) If we know that and
, then the time needed is:
The electric motor will take approximately 3.963 seconds to decrease its angular velocity by 75 %.
Answer:
C). Refraction
Explanation:
When light enters from one medium to another medium then it changes it's direction from its initial direction
the phenomenon of changing the direction due to change in the medium is known as Refraction of light
So here we know that when light strikes an interface which separates two medium then due to change in the medium we will have
so here we have
= two angles of the light in two mediums
= two refractive index of the two mediums
So correct answer will be
C). Refraction