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vitfil [10]
3 years ago
9

Earth is about 150 million kilometers from the Sun, and the apparent brightness of the Sun in our sky is about 1300 watts/m2. Us

e these two facts and the inverse square law for light to answer the questions.
Physics
1 answer:
vova2212 [387]3 years ago
6 0

Answer:

various parts have been answered

Explanation:

Inverse square for light is I_1r_1^2=I_2r_2^2

initial distance from sun to earth isr_1=150\times10^6

and intensity or apparent brightness of sun is I_1=1300\ W/m^2

a)

If distance from sun to earth is r_2=r_1/2=\frac{150\times10^6}{2}

then apparent brightness is  I_2=\frac{I_1r_1^2}{r_2^2}=\frac{1300\times r_1^2}{(r_1/2)^2}=5200

b)

If distance from sun to earth is  r_2=2r_1

then apparent brightness is  I_2=\frac{I_1r_1^2}{r_2^2}=\frac{1300\times r_1^2}{(2r_1)^2}=325\,W/m^2

c)

If distance from sun to earth is  r_2=7r_1

then apparent brightness is

I_2=\frac{I_1r_1^2}{r_2^2}=\frac{1300\times r_1^2}{(7r_1)^2}=26.5\,W/m^2

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Harman [31]

Let us consider body moves a distance S due to the force F.

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                                  Hence\ W= FScos\theta

                                                        = F.S

As per the question the power P is given as -

                                                  P=\frac{W}{\delta t}

                                                         =\frac{F.S}{\delta t}

                                                         = F.\frac{S}{\delta t}

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Hence alternative definition of power P = F.V


8 0
3 years ago
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What is the pendulum length whose period is 2.0s ?
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7 0
3 years ago
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The existence of the dwarf planet Pluto was proposed based on irregularities in Neptune's orbit. Pluto was subsequently discover
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Answer:

Acceleration due to gravity, a=4.61\times 10^{-14}\ m/s^2

Explanation:

It is given that,

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Distance between Neptune and Pluto, r=4.5\times 10^{12}\ m

The force of gravity is balanced by the gravitational force between Neptune and Pluto. It is given by :

a=\dfrac{Gm}{r^2}

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