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3 years ago

Please help??!

Physics

2 answers:

lina2011 [118]3 years ago

8 0

Answer:

Windy, whooping weather

Explanation:

thats the answer

KatRina [158]3 years ago

4 0

Answer: 4. Windy, whooping weather

Explanation: b/c it is!

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If an electron is accelerated from rest through a potential difference of 9.9 kV, what is its resulting speed? (e = 1.60 × 10-19

Nata [24]

Answer:

So speed of electron will be $5.89\times 10^{-7}m/sec$

Explanation:

We have given potential difference V = 9.9 KV

Charge on electron $e=1.6\times 10^{-19}$

So energy of electron $E=eV=1.6\times 10^{-19}\times 9.9\times 10^3=15.84\times 10^{-16}J$

This energy of electron will be equal to kinetic energy of electron

So $\frac{1}{2}mv^2=15.84\times 10^{-16}J$

$\frac{1}{2}\times 9.11\times 10^{-31}v^2=15.84\times 10^{-16}$

$v=5.89\times 10^{-7}m/sec$

So speed of electron will be $5.89\times 10^{-7}m/sec$

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3 years ago

How does a laser work?

a_sh-v [17]

Answer:

A laser is created when the electrons in atoms in special glasses, crystals, or gases absorb energy from an electrical current or another laser and become “excited.” The excited electrons move from a lower-energy orbit to a higher-energy orbit around the atom's nucleus.

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4 years ago

Can someone say for me ost right or wrong if it wrong say for me what is the answer plrase

saveliy_v [14]

Answer:

It is correct

Explanation:

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3 years ago

Someone pushes on a rock and measures the net force acting on it is 147 N and acceleration to be 7.5m/s2.What is the weight of t

kogti [31]

Some1 pushes u and then u defend your self

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3 years ago

What is the index of refraction?

laiz [17]

Answer:

a. the ratio of the speed of light in a vacuum to the speed of light in the material it is passing though

Explanation:

When a light ray enters from one medium to another, it bends. This is because the speed of light decreases as it enters a medium having more optical density. The speed of light is maximum in vacuum.

The refractive index determines the optical density of a medium. It is the ratio of the speed of light in the vacuum (c) to the speed of light in the material it is passing through (v).

$\mu=\frac{c}{v}$

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4 years ago

Read 2 more answers