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PilotLPTM [1.2K]

3 years ago

11

Why does light change its velocity (or slows down) when it encounters a glass lens?

1 answer:

Rufina [12.5K]3 years ago

6 0

Explanation:

what happens is that light slows down when it passes from the less dense air into the denser glass or water. This slowing down of the ray of light also causes the ray of light to change direction. It is the change in the speed of the light that causes refraction.

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If the 50 kg objects slows down to a velocity of 1 m/s how much kinetic energy does it have?

Bogdan [553]

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3 years ago

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Find the total electric charge of 1.7 kg of electrons. me=9.11×10−31kg, e=1.60×10−19C.

Gelneren [198K]

Answer:

$2.99\cdot 10^{11}C$

Explanation:

The mass of one electron is

$m_e = 9.11\cdot 10^{-31}kg$

So the number of electrons contained in M=1.7 kg of mass is

$N=\frac{M}{m_e}=\frac{1.7 kg}{9.11\cdot 10^{-31}kg}=1.87\cdot 10^{30}$

The charge of one electron is

$e=1.60\cdot 10^{-19} C$

So, the total charge of these electrons is equal to the charge of one electron times the number of electrons:

$Q=Ne=(1.87\cdot 10^{30})(1.6\cdot 10^{-19}C)=2.99\cdot 10^{11}C$

8 0

3 years ago

Which goes into which category?

Pavel [41]

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A car rusting

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The glow of a light bulb

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Burning toasts

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Water boiling

Yellow and blue paints mixed together

Wax melting

Crushing a rock with a hammer

Hope this helps!

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6 0

3 years ago

What is energy? a change that appears in an object when force is applied the property of a body that gives it mass the amount of

alexandr402 [8]

<span>Energy exists as light, heat, sound, mass, moving objects, gravity, fuel, chemicals, and electricity.</span>

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3 years ago

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Which if the following statements is true? A. Instantaneous acceleration is always changing. B. An object at rest has an instant

ycow [4]

B is the right one

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3 0

4 years ago