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RSB [31]
3 years ago
8

The sun emits energy in the form of electromagnetic waves produced by nuclear reactions deep in the sun's interior. Assume that

the rate of energy emission is W for this problem. Find the intensity of electromagnetic radiation at the surface of the sun (radius r =R = ). Ignore any scattering of waves as they move radially outward from the center of the sun. W/m2 Find the radiation pressure on an absorbing object at the surface of the sun, ignoring wave scattering. Pa Repeat for r = R/2, in the sun's interior. intensity of radiation W/m2 radiation pressure Pa What is the ratio of the intensity of radiation at the sun's surface to that given in Section 32.4 for sunlight just before it enters the earth's atmosphere? (Give only the order of magnitude of this ratio.)
Physics
1 answer:
tatiyna3 years ago
4 0

Answer:

I = W / 4π R_{s}²,   P = W / 2π c R_{s}², Io /I_{earth} = 10⁴  

Explanation:

The intensity is defined as the ratio between the emitted power and the area of ​​the spherical surface

               I = P / A

Since the emitted power is constant and has a value of W for this case, let's look for the area of ​​the sphere on the surface of the sun

             A = 4π R_{s}²

             I = W / 4π R_{s}²

.- The radiation pressure for total absorption is

             P = S / c

Where S is the Pointer vector that is equal to the intensity

Let's replace

             P = W / 2π c R_{s}²

.- We repeat for r = R_{s}/2

              I₂ = W / 4π (R_{s}/ 2)²

              I₂ = 4 W / 4π R_{s}²

              I₂ = 4 Io

              I₀ = W / 4piRs2

    We calculate the radiation pressure

             P₂ = I₂ / c

             P₂ = 4 I₀ / c

             P₂ = 4 (W / 4pi c Rs2)

.- the relationship between these magnitudes is

            I₂ / I₀ = 4

            P₂ / P₀ = 4

Let's calculate the intensity on the surface where the Earth is

            r = 1.50 10¹¹ m

           I_{earth} = W / 4π r²

           Io / I_{earth}   = r² /R_{s}²

          Io /I_{earth}  = (1.5 10¹¹ / 6.96 10⁸) 2

          Io /I_{earth} = 4.6 10⁴

          Io /I_{earth} = 10⁴

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posledela

Answer:

See answers below

Explanation:

a.

F = mg,

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m = 1.58 kg

b.

Fnet = Applied force - resistance,

Fnet = 18 N - 4.30 N,

Fnet = 13.70 N

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13.70 N = (1.58 kg)a

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For the free body diagram, draw a box with an upward arrow labeled 15.5 N, a downward label labeled 15.5 N, a right label labeled 18 N, and a left label labeled 4.30 N.

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2 years ago
How is pressure measured? question 1 options: pressure is measured as force per inch. pressure is measured as force per gram. pr
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Pressure is measured as force per unit area, which is the third option.

<h3>What is pressure?</h3>

Pressure is amount of force that is applied over a given area divided by the size of this area.

Pressure is calculated by multiplying the force applied on the object by the area covered.

Since force is measured in Newtons (N) and area is measured in m², the unit of pressure is Nm².

Therefore, pressure is measured as force per unit area.

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brainly.com/question/12971272

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7 0
2 years ago
(20) A rocket is launched vertically. At time t = 0 seconds, the rocket’s engine shuts down. At the time, the rocket has reached
Diano4ka-milaya [45]

Answer:

Explanation:

Given that,

h(t) = -9.8t² / 2 + 125t + 500

for t > 0.

At t = 0, the rocket is at height h = 500m, at a velocity of Vo = 125m/s.

We want to find the maximum height reached by rocket

Using mathematics maxima and minima

let find the turning point when dh/dt = 0

dh/dt = -9.8t + 125

dh / dt = 0 = -9.8t + 125

9.8t = 125

t = 125 / 9.8

t = 12.76s

Let find the turning point to know if this time t = 12.76 is maximum or minimum point

Let find d²h / dt²

d²h / dt² = -9.8

Since, d²h/dt² < 0, then, at t = 12.76s is the maximum points.

Then, the maximum height reached is

h =  -9.8t² / 2 + 125t + 500

h =  -9.8(12.76)² / 2 + 125(12.76) + 500

h = -797.80 + 1595 + 500

h = 1297.2 m

The maximum height reached is 1297.2 m

From the attachment, the maximum height is 1297.2m at t = 12.76sec.

Comment, the result are the same for both the analysis aspect and the graphical aspect.

3 0
3 years ago
A 48 kg cart is sitting motionless at the top of the hill. At what height, did the cart start at, to reach 88435 J of energy at
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Answer : The height is 188 meters  

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Given that,

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We know that,

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So, the height of the top is 188 meters.

7 0
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Which can make 4 covalent bonds? Carbon, Silicon, or both?
grin007 [14]

Answer:

I would say both

Explanation:

Each silicon atom has four valence electrons which are shared, forming covalent bonds with the four surrounding Si atoms.

Carbon contains four electrons in its outer shell. Therefore, it can form four covalent bonds with other atoms or molecules. The simplest organic carbon molecule is methane (CH4), in which four hydrogen atoms bind to a carbon atom (Figure 1).

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3 years ago
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