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AfilCa [17]
3 years ago
5

Our sun is unusual because it does not belong to a(n) ____.a.solar systemc.galaxyb.universed.binary star system please select th

e best answer from the choices provided
Physics
2 answers:
damaskus [11]3 years ago
5 0
Binary star is the anwser


RoseWind [281]3 years ago
3 0
The answer would be Binary star system
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A package is dropped from a helicopter that is moving upward at 20.0 m/s.
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Explanation:

<h3>We have for velocity of package v= 20 - 9.8t and for distance from the ground y = h + 20t - 4.9t2.</h3><h3>We have y = 0 and t = 18.0 s we have h = 4.9·182 - 20·18 = 1227.6 m.</h3><h3>Velocity at landing v = 20 - 9.8·18 = - 156.4 m/s </h3>

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How could you decrease the total energy of a system consisting of a jar full of water? O A. Heat the jar in a microwave oven. O
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A

Explanation:

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A compound wall consists of parallel layers of two different materials, 10 cm of brick and 2 cm of wood. If the difference of te
RSB [31]

The temperature difference between the wooden wall is 16⁰C, and the heat current per square metre of the wall is 7,325 W/m².

<h3>Temperature difference between the wooden wall</h3>

The temperature difference between the wooden wall is calculated as follows;

  • Let the brick wall =  wall A
  • Let the wooden wall = wall B
  • Let the area of the walls = A

\frac{dQ_A}{dt } = \frac{dQ_B}{dt} \\\\\frac{K_A \Delta T_A \times  A}{L_A} = \frac{K_B \Delta T _B \times A}{L_B}\\\\\frac{K_A \Delta T_A }{L_A} = \frac{K_B \Delta T _B}{L_B}\\\\\frac{0.5 \times 20}{0.1} = \frac{0.125 \times \Delta T _B }{0.02} \\\\100 = 6.25\Delta T _B\\\\\Delta T _B = \frac{100}{6.25} \\\\\Delta T _B = 16 \ ^oC

<h3 /><h3>Heat flowing in the walls</h3>

Q = KL(ΔT)

Q = 0.5 x 0.1 x (20 + 273)

Q = 14.65 W

<h3>Heat current per square meter of the Walls</h3>

QA = W/A

QA = (14.65)/A

  • Let the area of the wall = 10 cm x 2 cm = 0.1 m x 0.02 m = 0.002 m².

QA = 14.65/0.002

QA = 7,325 W/m²

Learn more about thermal conductivity here: brainly.com/question/11213835

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3 years ago
The doppler effect is sensitive only to motion along the line of sight. <br> a. True <br> b. False
4vir4ik [10]
Its vey True trust me on this when I say it is
4 0
3 years ago
Reflection of the images example
NISA [10]

Answer:

reflection of water ,sound and water waves etc

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