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3 years ago

What is the voltage of a circuit when 5C of charge flows with a 7V EMF?

Physics

1 answer:

GuDViN [60]3 years ago

5 0

You just said that the EMF across the circuit is 7V. So the voltage is 7 volts.

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3 years ago

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A uniform disk of 10 kg and radius 4.0 m can rotate in a horizontal plane about a vertical axis through its center. The disk is

o-na [289]

Answer:

18.75 rad/s

Explanation:

Moment of inertia of the disk;

I_d = ½ × m_disk × r²

I_d = ½ × 10 × 4²

I_d = 80 kg.m²

I_package = m_pack × r²

Now,it's at 2m from the centre, thus;

I_package = 5 × 2²

I_package = 20 Kg.m²

From conservation of momentum;

(I_disk + I_package)ω1 = I_disk × ω2

Where ω1 = 15 rad/s and ω2 is the unknown angular velocity of the disk/package system.

Thus;

Plugging in the relevant values, we obtain;

(80 + 20)15 = 80 × ω2

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5 0

3 years ago

The energy per unit volume in an electromagnetic wave is: ________

Marianna [84]

Answer:

Explanation:

Electromagnetic waves are waves that are generated when an electric field and a magnetic field vibrate together. They are usually created whenever an electric field collides with a magnetic field.

In more generic terms for an electric field, the energy per unit volume is given by:

Energy density = $\dfrac{1}{2}\varepsilon _oE^2$

For magnetic field:

Energy density = $\dfrac{\beta^2}{2 \mu _o}$

∴

For the electromagnetic wave (u):

Total energy density is:

$u = \dfrac{1}{2}\varepsilon_oE^2 + \dfrac{\beta ^2}{2 \mu_o}$

Due to the fact that the energy related with both fields is equivalent:

Then:

E = cB

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3 years ago