Answer:
F = 5.09 10¹⁰ q Q / a²
Explanation:
The electric force is given by Coulomb's law
F = k q₁ q₂ / r²
Let's apply this equation to our case, we have four force, the charge in the singer is positive Q, so the two upper charges have repulsive forces directed in the diagonals of the square and the two lower charges that are negative, have attractive forces directed at the length of the diagonals.
To find the total force we know how to use Newton's second law
On the x-axis we can see that all forces will cancel out
On the Y axis, all forces have the same direction, therefore the four forces are added.
We can find the value of one of them
The distance from the corner to the center of the square is
r² = (a / 2)² + (a / 2)² = 2 (a / 2)²
r² = a² / 2
Force is worth
F = k q Q / r²
F = k q Q 2 / a²
Let's use trigonometry to find the vertical component of this force
sin45 = / F
= F sin 45
= k q Q 2 / a² 07071
The total force is the
F = 4
F = k q Q / a2 8 0.7071
F = 5.09 10¹⁰ q Q / a²
<span>Use the cosine rule to solve for the distance the wind pushed them to the east and because this all happened in an hour, you can say they travelled this distance per hour.
+-130 km due east which means the wind speed was +-130km/h.
So for example i used a^2=b^2+c^2-2bc(cos75) b will be the distance they travelled and c= 135cos75=35km now all you do is substitute in and you will get your distance that the wind pushed them to the east and because it was an hour of travel the distance as said before will be per hour. </span>
Answer:
Explanation:
As we know that initial angular speed of the tub was zero and then it increases uniformly to 4 rev/s in t = 6.00 s
so we will have
Now when the tub will comes to rest uniformly after opening the lid in time interval of t = 15 s
then we have
Now total angular displacement of the tub is given as
so number of revolutions is given as
Answer: No. Circuit should be closed.
Explanation:
A changing magnetic field induces emf in a circuit which is placed in it. This induced emf causes current to flow through it. This is given by Faraday's law which states that induced emf results due to rate of change of magnetic flux.
Current flows only through a closed circuit. Thus, when a wire is moved up and down in a magnetic field, it will not induce emf because the wire does not form a loop. It is an open circuit.