Answer:
A light year is the distance light travels in a year. ... And an astronomical unit is the average distance between the earth and the sun. So the distance to the sun is by definition one AU. A parsec is the distance at which one astronomical unit subtends an angle of one second of arc.
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The correct options are B and C
Let us assume the amplitude of the two sinusoidal waves be A1 and A2
As it is mentioned that the waves are identical, therefore A1=A2= a
The resultant wave of any two waves is given by the formula:
Resultant wave=
where A1 and A2 are amplitudes of waves 1 and 2 and is the angle between the waves
Now as per the formula, it is the the factor 2cos that will decide that amplitude is greater than original or not
Hence we know that maximum value of cos is when is 0 degrees
Now it is known that value of cos varies from 1 to 0 for o degrees to π/2
and the value varies from 0 to -1 for angles π/2 to π
Case 1: when =0 degree
Resultant wave R =
Case 2: When is less than 90
let us consider
Resultant wave R =
case 3:
When is less than 120
case 4: when is less than 180 degrees
the value will be 0
Hence only option b and d are correct
For further reference:
brainly.com/question/14286615?referrer=searchResults
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Immediately after the switch is closed, the capacitor acts like a short circuit for a very small time. We can calculate the currents through each resistor by first calculating the total resistance:
Req = 1/(1/3+1/6) + 8 = 1/(3/6) + 8 = 2 + 8 = 10 ohms.
IR1 = E / Req = 42 / 10 = 4.2 A.
VR2 = VR3 = E * R23 / Req = 42 * 2 / 10 = 8.4 V
IR2 = VR2 / R2 = 8.4 / 6 = 1.4 A.
IR3 = VR3 / R3 = 8.4 / 3 = 2.8 A.
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Answer:
8v
Explanation:
First we apply super position principle
Vt= v1 + v2+ v3
Remove qa
But vt= 20v
So V = v2+v3
V1= 20-15
= 5v
Remove qb
V= v1+v3
V=8v
So the potential when qa and qc are remove is the potential due to qb
Which is 8v