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Ne4ueva [31]
3 years ago
11

Item 8

Physics
1 answer:
Elza [17]3 years ago
8 0

Answer:isotopes

Explanation:Isotopes form when the number of neutrons and atomic number change except for the protons don't change

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What is kinematics?<br>explain!!~​
KIM [24]

Answer:

it is an 3d array of structure which involves inopperation methods

Explanation:

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3 years ago
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If you lie on the ground at night with no cover, you get cold rather quickly. Much of this is due to energy loss by radiation. A
marin [14]

Answer:

301.48 J/s

Explanation:

We are given;

Temperature of the sky dropping to −40∘C: T_o = -40°C = -40 + 273 = 233 K

Temperature of your skin and clothes: T = 30°C = 30 + 273 = 303 K

Body surface area of human body is around 2 m². But here only half of the body is facing the sky, Thus Area is: A = 2/2 = 1 m²

To solve this, we will use the equation for thermal heat transfer known as the Stefan bolt Mann equation.

ΔQ/Δt = εσA(T⁴ - (T_o)⁴)

Where;

ΔQ/Δt is the rate at which you body loses energy by radiation

ε is the emissivity of the human body with a value of 0.97

σ is Stefan boltzmann constant with a value of 5.67 X 10^(-8) W/m².K⁴

Thus;

ΔQ/Δt = 0.97 × 5.67 X 10^(-8) × 1(303⁴ - 233⁴)

ΔQ/Δt = 301.48 J/s

7 0
3 years ago
Help me, please !! lolll
sattari [20]
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A combination of pulleys are called <br>Pls help<br><br>​
Hatshy [7]

Answer:

A compound pulley

Explanation:

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Answer:

Can u show the whole question

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