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Anettt [7]
3 years ago
10

A flat circular mirror of radius 0.210 m is lying on the floor. Centered directly above the mirror, at a height of 0.660 m, is a

small light source. Calculate the diameter of the bright circular spot formed on the 2.70 m high ceiling by the light reflected from the mirror.
Physics
1 answer:
Bess [88]3 years ago
5 0

Answer:

2.14 m

Explanation:

The mirror creates a virtual light source 0.66 m under it that is the reflection of the real one. This will project a cone of light on the ceiling. The cone of light will be delimited by the edges of the mirror.

When the cone has been projected 0.66 m (touching the mirror) it will have a diameter of 0.42 m. So when it gets projected on the wall, that is 2.7 + 0.66 = 3.36 m away, it will have a diameter of:

\frac{0.42}{0.66} = \frac{x}{3.36}

x = \frac{0.42*3.36}{0.66} = 2.14 m

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Which of the following statements describes an interaction between the atmosphere and biosphere?
Schach [20]

Answer:

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Explanation:

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3 years ago
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geniusboy [140]

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7 0
4 years ago
Some unpolarized light has an intensity of 1375 W/m2 before passing through three polarizing filters. The transmission axis of t
chubhunter [2.5K]

Answer:

intensity of the light that emerges from the three filters is 560.80 W/m²

Explanation:

Given data

intensity  I = 1375 W/m2

angle 1 = 31.0°

angle 2  = 41.0°

to find out

intensity of the light that emerges from the three filters

solution

we know intensity of light pass 1st polarize = I/2 = 1375 / 2 = 687.5  W/m2

so intensity after 2nd polarize pass = I 1st cos²(θ)

I 2nd = 687.5 cos²(31) = 687.5 ( 0.836754)  = 575.27 W/m2

and

intensity after 3rd polarize pass = I 2nd cos²(θ)

I 3rd = 575.27 cos²(41) = 575.27 (0.974839) = 560.80 W/m2

so that intensity of the light that emerges from the three filters is 560.80 W/m²

4 0
4 years ago
A Car with drives into a solid object with 70 km/h, from which height would it fall if it was in free fall?​
Ilya [14]

Answer:

18.9 m.

Explanation:

From the question given above, the following data were obtained:

Initial velocity (u) = 0 m/s

Final velocity (v) = 70 km/h

Height (h) =?

Next, we shall convert 70 km/h to m/s. This can be obtained as follow:

3.6 km/h = 1 m/s

Therefore,

70 km/h = 70 km/h × 1 m/s / 3.6 km/h

70 km/h = 19.44 m/s

Finally, we shall determine the height. This can be obtained as follow:

Initial velocity (u) = 0 m/s

Final velocity (v) = 19.44 m/s

Acceleration due to gravity (g) = 10 m/s²

Height (h) =?

v² = u² + 2gh

19.44² = 0² + (2 × 10 × h)

377.9136 = 0 + 20h

377.9136 = 20h

Divide both side by 20

h = 377.9136 / 20

h = 18.9 m

Thus, the car will fall from a height of 18.9 m

8 0
3 years ago
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