Which of the following statements is true? A. X-rays have longer wavelengths than microwaves. B. Radio waves have shorter wavele
1 answer:
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The total amount of energy per hour is
Explanation:
In this problem we are told that the amount of energy reaching a square meter in the United States per hour is
The total surface area of the United States is
And converting into squared metres,
Therefore, the total energy reaching the entire United States per hour is given by:
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Answer:
* if the two plates have the same charge sign F_net = 0
*if one plate is positive and the other is negative F_net = 59.4 N
Explanation:
The electric field created by a parallel plate is
E =
where sigma is the charge density
σ = Q / A
we substitute
E =
E =
E = 4.487 10⁶ N / C
the electric force is
F = E / q
in this force it is a vector, so if the charges are of the same sign they repel and if they are of the opposite sign they attract. In this case, the test load is between the two plates that have the same load sign, so the forces are in the opposite direction.
* if the two plates have the same charge sign
F_net = F₁ - F₂
F_net = q (E₁ -E₂)
since the electric field does not depend on the distance
E₁ = E₂
in consecuense
F_net = 0
In a more interesting case
*if one plate is positive and the other is negative
F_net = F₁ + F₂
F_net = q (E₁ + E₂) = 2 q E₁
F_net = 2 6.62 10⁻⁶ 4.487 10⁶
F_net = 59.4 N
net force goes from positive to negative plate