3 years ago

Explain why we have seasons on earth?

1 answer:

5 0

It’s because of the tilt of the earth’s axis, it means that w he n the earth leans towards the sun it’s summer, when it leans away from the sun it’s winter and in between the 2 spring and autumn (fall) occur.

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A bottle 5.89 cm tall is 56.2 cm to the left of a plane mirror. What is the height of the image formed?

Hoochie [10]

Answer:

5.89cm

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3 years ago

Two cannonballs are dropped from a second-floor physics lab at height h above the ground. Ball B has four times the mass of ball

frez [133]

Formula of kinetic energy

$e = \frac{1}{2} m {v}^{2}$

Therefore Kinetic energy of ball B is 4 times more than ball A.

ans is KB=4KA

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3 years ago

The distance between a proton and an electron is cut in half how does the force of attraction change

meriva

Answer:

There would be a great force of attraction since the distance is smaller.

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3 years ago

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

viva [34]

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

4 0

3 years ago

If you make an intercontinental phone call, your voice is transformed into electromagnetic waves routed via satellite in geosync

bixtya [17]

Answer:

It will take 0.093 seconds to our voice to reach or to be heard at the other end.

Explanation:

The total distance covered by the wave = 28000 km = 28,000,000 m

1 km = 1000 m

Speed of the light = $3\times 10^8 m/s$

Time taken by the electromagnetic wave to travel the given distance = T

$Speed=\frac{Distance}{Time}$

$T=\frac{28,000,000 m}{3\times 10^8 m/s}=0.093 s$

The time taken by the electromagnetic wave is 0.093 seconds.

8 0

3 years ago