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Vadim26 [7]
3 years ago
15

Reading glasses use what property of light waves

Physics
1 answer:
tresset_1 [31]3 years ago
5 0
Visible range of electromagnetic radiation
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shuffling shoes

Explanation:

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If an element is a semi-conductor, which classification correctly describes it?
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Metal

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semiconductors are materials which have a conductivity between conductors (generally metals)

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Skater begins to spend with arms held out at shoulder height. The skater wants to match the speed of the spin to the beat of the
Aleksandr [31]

Answer:

the moment of inertia with the arms extended is Io and when the arms are lowered the moment

I₀/I > 1    ⇒   w > w₀

Explanation:

The angular momentum is conserved if the external torques in the system are zero, this is achieved because the friction with the ice is very small,

           L₀ = L_f

           I₀ w₀ = I w

          w =\frac{I_o}{I} w₀

where we see that the angular velocity changes according to the relation of the angular moments, if we approximate the body as a cylinder with two point charges, weight of the arms

          I₀ = I_cylinder + 2 m r²

where r is the distance from the center of mass of the arms to the axis of rotation, the moment of inertia of the cylinder does not change, therefore changing the distance of the arms changes the moment of inertia.

If we say that the moment of inertia with the arms extended is Io and when the arms are lowered the moment will be

        I <I₀

        I₀/I > 1    ⇒   w > w₀

therefore the angular velocity (rotations) must increase

in this way the skater can adjust his spin speed to the musician.

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3 years ago
If a substance absorbs energy but its temperature does not change, then the internal energy is changing.
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If a substance absorbs energy but its temperature does not change, then the internal potential energy is changing.

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Use the drop-down menus to identify each labeled part of the diagram.
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<u>B:warm fluid rises</u>

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Just took the assessment!!

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