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Bogdan [553]
3 years ago
14

What causes the phases of the moon as seen from earth?

Physics
2 answers:
adelina 88 [10]3 years ago
5 0

Answer:

a. light from the sun reflects off the moon as it orbits earth.  

Explanation:

Moon does not have its own light, it reflects the sunlight falling on it. Phases of moon are the different shapes of the moon that we see. There are mainly 5 phases of moon: New moon, Crescent, Half moon, gibbous and full moon. These shapes are due to the illuminated portion of the moon (by the Sun) that is visible from the Earth.

Thus, option a is correct.

enyata [817]3 years ago
4 0
A ~~~~~~~~~~~~~~~~~~~~~~`
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A spherical, conducting shell of inner radius r1= 10 cm and outer radius r2 = 15 cm carries a total charge Q = 15 μC . What is t
lutik1710 [3]

a) E = 0

b) 3.38\cdot 10^6 N/C

Explanation:

a)

We can solve this problem using Gauss theorem: the electric flux through a Gaussian surface of radius r must be equal to the charge contained by the sphere divided by the vacuum permittivity:

\int EdS=\frac{q}{\epsilon_0}

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E is the electric field

q is the charge contained by the Gaussian surface

\epsilon_0 is the vacuum permittivity

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Here we are between the inner radius and the outer radius of the shell:

r_1 = 10 cm\\r_2 = 15 cm

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b)

Here we want to find the magnitude of the electric field at a distance of

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Outside the outer surface of the shell, the electric field is equivalent to that produced by a single-point charge of same magnitude Q concentrated at the centre of the shell.

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r=20 cm = 0.20 m is the distance from the centre of the shell

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E=\frac{15\cdot 10^{-6}}{4\pi (8.85\cdot 10^{-12})(0.20)^2}=3.38\cdot 10^6 N/C

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