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AURORKA [14]
2 years ago
7

Premium

Physics
2 answers:
Luda [366]2 years ago
5 0

Explanation:

the formula of speed is distance traveled by time it work

salantis [7]2 years ago
4 0
<h3>Answer:</h3>

31.25 cm/sec

__________________________________________________________

<h3>Explanation:</h3>

<u>We are given:</u>

Distance travelled = 150 cm

Time taken = 4.8 seconds

<u>Final Speed of the Marble:</u>

Speed of the marble = Distance travelled / Time taken

Speed of the marble = 150 / 4.8

Speed of the marble = 31.25 cm/sec

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inysia [295]

Answer:

4.42 x 10⁷ W/m²

Explanation:

A = energy absorbed = 500 J

η = efficiency = 0.90

E = Total energy

Total energy is given as

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E = 555.55 J

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Power of the beam is given as

P = E /t

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P = 138.88 Watt

d = diameter of the circular spot = 2.00 mm = 2 x 10⁻³ m

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A = (0.25) πd²

A = (0.25) (3.14) (2 x 10⁻³)²

A = 3.14 x 10⁻⁶ m²

Intensity of the beam is given as

I = P /A

I = 138.88 / (3.14 x 10⁻⁶)

I = 4.42 x 10⁷ W/m²

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2 years ago
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Answer:

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