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nexus9112 [7]
2 years ago
6

You can use the curved part of a spoon as a mirror because it ________ light.

Physics
2 answers:
zhenek [66]2 years ago
8 0

Answer:

Reflects

Explanation:

A metal spoon looks very shiny because its surface is very smooth, which is why it acts like a mirror and reflects light very well.

Reika [66]2 years ago
6 0

Answer:

A.

Explanation:

the spoon reflects light like a mirror !

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A planet is 10 light years away from Earth. What speed would you need to go for a trip to the planet and back to take only 5 yea
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Answer:

a. speed, v = 0.97 c

b. time, t' = 20.56 years

Given:

t' = 5 years

distance of the planet from the earth, d = 10 light years = 10 c

Solution:

(a) Distance travelled in a round trip, d' = 2d = 20 c = L'

Now, using Length contraction formula of relativity theory:

L'' = L'\sqrt{1 - \frac{v^{2}}{c^{2}}}                           (1)

time taken = 5 years

We know that :

time = \frac{distance}{speed}

5 = \frac{L''}{v}                                                      (2)

Dividing eqn (1) by v on both the sides and substituting eqn (2) in eqn (1):

\frac{L'\sqrt{1 - \frac{v^{2}}{c^{2}}}}{v} = 5

\frac{20'\sqrt{1 - \frac{v^{2}}{c^{2}}}}{v} = 5

Squaring both the sides and Solving above eqution, we get:

v = 0.97 c

(b) Time observed from Earth:

Using time dilation:

t'' = \frac{t'}{\sqrt{1 - \frac{v^{2}}{c^{2}}}}

t'' = \frac{5}{\sqrt{1 - \frac{(0.97c)^{2}}{c^{2}}}}

Solving the above eqn:

t'' = 20.56 years

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