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4 years ago

Does electromagnetic waves transfer light energy?

Physics

1 answer:

Andreas93 [3]4 years ago

4 0

Answer:

Electronmagnetic waves: yes

Mechanical waves: no

Explanation:

Electromagnetic waves consist of electric fields and magnetic fields that oscillate perpendicularly to each other, and also in a plane perpendicular to the direction of propagation of the wave (therefore they are called "transverse waves".

As all waves, electromagnetic waves transport energy (but not matter). In particular, the type of energy transferred by electromagnetic waves is in the form of radiation, also called light energy.

Conversely, mechanical waves consist of oscillations of the particles in a medium. Mechanical waves also carries energy (but not matter), but not in the form of radiation (light energy): in fact, the energy is carried as vibrations of the particles in the medium, so it is a different type of energy.

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What is the parallel axis theorem and how is it used? Please explain the equation.

Tema [17]

Explanation:

If an object has a moment of inertia I₀ about an axis, then the moment of inertia about a different, parallel axis is I = I₀ + md², where d is the distance between the axes.

For example, consider a horizontal thin rod rotating about a vertical axis passing through its center. It has mass m and length L. Its moment of inertia is known to be I = 1/12 mL².

Now consider the same rod, but this time we move the axis of rotation L/2 to the end of the rod. We can use parallel axis theorem to find the new moment of inertia:

I = I₀ + md²

I = 1/12 mL² + m (L/2)²

I = 1/12 mL² + 1/4 mL²

I = 1/3 mL²

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4 years ago

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3 years ago

A man standing on a bridge throws a stone horizontally with a speed of 20m/s. The stone hits the water below 3 seconds later. Ho

SpyIntel [72]

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3 years ago

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The acceleration of an object (in m/s2) is given by the function a ( t ) = 6 sin ( t ) a(t)=6sin(t). The initial velocity of the

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Answer:

$v(t)=-6cos(t)+4$

Explanation:

We have acceleration given by

$a(t)=6sin(t)$

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Velocity is given by

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The equation will be

$\mathbf{v(t)=-6cos(t)+4}$

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4 years ago

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