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lara31 [8.8K]
3 years ago
7

How far from a -7.80 μC point charge must a 2.40 μC point charge be placed in order for the electric potential energy of the pai

r of charges to be -0.500 J ? (Take the energy to be zero when the charges are infinitely far apart.)
Physics
1 answer:
Naddik [55]3 years ago
8 0

Answer:

Distance between two point charges, r = 0.336 meters

Explanation:

Given that,

Charge 1, q_1=-7.8\ \mu C=-7.8\times 10^{-6}\ C

Charge 2, q_2=2.4\ \mu C=2.4\times 10^{-6}\ C

Electric potential energy, U = -0.5 J

The electric potential energy at a point r is given by :

U=k\dfrac{q_1q_2}{r}

r=k\dfrac{q_1q_2}{U}

r=9\times 10^9\times \dfrac{-7.8\times 10^{-6}\times 2.4\times 10^{-6}}{-0.5}

r = 0.336 meters

So, the distance between two point charges is 0.336 meters. Hence, this is the required solution.

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Answer:

50 m

Explanation:

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Given:

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The kinetic energy of a rotating body is generally written as K=12Iω2, where I is the moment of inertia. Find the moment of iner
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Answer:

See explanation

Explanation:

We have a mass m revolving around an axis with an angular speed \omega, the distance from the axis is r. We are given:

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and also the formula which states that the kinetic rotational energy of a body is:

K =\frac{1}{2}I\omega^2.

Now we use the kinetic energy formula

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After replacing in the previous equation we get:

K =\frac{1}{2}m(\omega r)^2

now we have the following:

K =\frac{1}{2}m(\omega r)^2 =\frac{1}{2}Iw^2

therefore:

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I = 13*(0.5)^2=3.25 [Kg*m^2]

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Una grúa eleva un tubo de concreto de
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What magnification will be produced by a lens of power –4.00 D (such as might be used to correct myopia) if an object is held 43
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Answer:

The magnification is m  = 0.3674

Explanation:

From the question we are told that

  The  power of the lens is  P = -4.00 D(dioptre)

Generally  1 dioptre = 1 \ meter

  The object distance is u =  -43 \ cm the negative sign is because the distance is measured in the opposite direction of incident light (i.e away )

 Generally the focal length is mathematically represented as

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converting to  cm  

 =>   f = 0.25 \ m = 0.25 * 100 = 25 \ cm

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Generally the magnification is mathematically represented as

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The Kinetic energy would be 1/2IL².

<h3>What is Rotational Kinetic energy ?</h3>

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Similarly rotational kinetic energy is given by = 1/2IL²

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