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Lera25 [3.4K]
4 years ago
15

Do all electromagnetic waves travel at the speed of light, carry energy, and travel through a vacuum?

Physics
1 answer:
olchik [2.2K]4 years ago
4 0
Yes they do. You got that right.
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A solenoid of 2100 turns, area 10 cm2, and length 30 cm carries a current of 4.0 A. (a) Calculate the magnetic energy stored in
nikitadnepr [17]

Answer:

E = 0.1472  J

Explanation:

Given that,

The number of turns in the solenoid, N = 2100

Area of the solenoid, A = 10 cm² = 0.001 m²

The length of the solenoid, l = 30 cm = 0.3 m

Current in the solenoid, I = 4 A

We need to find the magnetic energy stored in the solenoid. The expression for the stored energy is :

E=\dfrac{1}{2}LI^2

Where

L is self inductance of the solenoid,

L=\dfrac{\mu_oN^2A}{l}\\\\L=\dfrac{4\pi \times 10^{-7}\times 2100^2\times 0.001}{0.3}\\\\L=0.0184\ H

So,

E=\dfrac{1}{2}\times 0.0184\times 4^2\\\\E=0.1472\ J

So, 0.1472  J of energy is stored in the solenoid.

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3 years ago
If a pitcher throws a baseball 10 m in 30 seconds - what would be the average speed of the baseball
dangina [55]
S = d/t
S = 10m/30s
S = 0.33m/s
6 0
3 years ago
Question 7 of 10<br> What is cos(22")?<br> O A. 0.93<br> B. 0.22<br> C. 0.37<br> O D. 0.40
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Answer:

c

Explanation:

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How does Pascal's principle describe pressure throughout a fluid?
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Answer:

Uniform

Explanation:

The Pascal's principle states that a change in pressure applied to an enclosed fluid is transmitted unchanged to all parts of the fluid and to the container's wall.

This implies that there is no change in magnitude of pressure at every point of the fluid and the walls of the container. Hence you can say that pressure is equal in all directions at any point of the fluid.

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Help me answer this quick please
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Mass of oxygen stays the same.

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