The answer is 1 m/s. :::))))
Answer: a) 6.7 ; b) -9.5 * 10^-7 C induced in the dielectric on the positive plate and 9.5 * 10^-7 C induced in the other side of the dielectric close to the negative plate.
Explanation: In order to solve this problem we have to use the formule for two parallel plates capacitor, which is given by:
C= εo*A/d where A and d are the cross section and separation of the plates, respectively.
Aditionally we know that C= Q/ΔV and ΔV = E*d
By uning both expression we have:
C= εo*A/d=Q/ΔV=εo*A/d=Q/E*d then
with a dielectric between the plates, the new C is obtained by multiply by k the initial capacitance.
finally we have
εo*k*A=Q/E
then k= Q/(E*εo*A)= 6.7
In the dielectric is induced oposite charge to each plate of the capacitor, The value of induced charge in the dielectric is the same for the capacitor but with oposite sign.
<u>Answer:</u>
For 1: The correct option is Option C.
For 3: The final velocity of the opponent is 1m/s
<u>Explanation: </u>
During collision, the energy and momentum remains conserved. The equation for the conservation of momentum follows:
...(1)
where,
are the mass, initial velocity and final velocity of first object
are the mass, initial velocity and final velocity of second object
<u>For 1:</u>
We are Given:
Putting values in equation 1, we get:
Hence, the correct answer is Option C.
Impulse is defined as the product of force applied on an object and time taken by the object.
Mathematically,
where,
F = force applied on the object
t = time taken
J = impulse on that object
Impulse depends only on the force and time taken by the object and not dependent on the surface which is stopping the object.
Hence, the impulse remains the same.
Let the speed in right direction be positive and left direction be negative.
We are Given:
Putting values in equation 1, we get:
Hence, the final velocity of the opponent is 1m/s and has moved backwards to its direction of the initial velocity.
It would be a plane mirror, since the average household mirror is flat.
Answer:
a
The thickness is
b
The thickness is
Explanation:
From the question we are told that
The wavelength of the laser light is
The refractive index of the plastic rod is
The refractive index of the transparent coating is
For maximum transmission of light into the rod the reflection would be minimum and this minimum reflection is mathematically represented as
Where m is the order of interference which is equal to 1
t is the thickness
Substituting values
For minimum transmission of light into the rod the reflection would be maximum and this maximum reflection is mathematically represented as
Where m = 0 this because the transmission of light is minimum
Substituting values