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Fantom [35]
3 years ago
6

Width, height, thickness and thermal conductivity of a single pane window and the air space of a double pane window. Representat

ive winter surface temperatures of single pane and air space. FIND: Heat loss through single and double pane windows.

Physics
1 answer:
KonstantinChe [14]3 years ago
5 0

Complete Question

The schematics is shown on the first uploaded image

Answer:

For single pane is  Q  =1.96 *10^{4}} \  W  

For  double pane is  Q_2  = 120 \  W

Explanation:

Generally the heat loss through  a single pane is mathematically represented by  Fourier’s law as

      Q  =  k_g *  H^2  *  \frac{ T_1 - T_2 }{L}

=>    Q  =  1.4  *  2^2 *  \frac{ 15 -(-20)  }{ 5 *  \frac{1 \ m}{1000 \ mm}}

=>    Q  =1.96 *10^{4}} \  W        

Generally the heat loss through  a double pane is mathematically represented by  Fourier’s law as

      Q_2  =  k_a *  H^2  *  \frac{ T_1 - T_2 }{L}

=>    Q_2  =  0.024  *  2^2 *  \frac{ 10 -(-15)  }{ 10 *  \frac{1 \ m}{1000 \ mm}}

=>    Q_2  = 120 \  W  

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Umnica [9.8K]

Explanation:

a) How much work is done by gravity?

  • w = f x d
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b) How much work is done by tension?

  • v²=u²+2as
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  • 0.56=0.06+2a x5.5
  • 2a x5.5 = 0.56 - 0.06
  • 2a x 5.5 =0.5
  • 11a=0.5
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3 years ago
What would the circuit resistance be if a 7.5 Amp draw was present with the engine running and the charging system producing 15
AlladinOne [14]

Answer:

2 ohms

Explanation:

Hi there!

Ohm's law states that V=IR where V is the voltage, I is the current and R is the resistance.

Plug in the given information (I=7.5, V=15) and solve for R

V=IR\\15=(7.5)R

Divide both sides by 7.5 to isolate R

\frac{15}{7.5}= \frac{7.5R}{7.5}  \\2=R

Therefore, the circuit resistance would be 2 ohms.

I hope this helps!

4 0
3 years ago
which statement is true of a wave that's propagating along the pavement and girders of a suspension bridge?
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<u>Question:</u>

Which statement is true of a wave that’s propagating along the pavement and girders of a suspension bridge?

A. The wave is mechanical, with particles vibrating in a direction that is parallel to that of the wave, forming compressions and rarefactions.

B. The wave is electromagnetic, with particles vibrating in a direction that is parallel to that of the wave, forming compressions and rarefactions.

C. The wave is mechanical, with particles vibrating in a direction that is perpendicular to that of the wave, forming crests and troughs.

D. The wave is electromagnetic, with particles vibrating in a direction that is perpendicular to that of the wave, forming crests and troughs.

E. The wave is mechanical, with particles vibrating in a direction that is perpendicular to that of the wave, forming compressions and rarefactions.

Answer:

The statement “The wave is mechanical, with particles vibrating in a direction that is perpendicular to that of the wave forming compressions and rarefactions” is true of a wave that’s propagating along the pavement and girders of a suspension bridge.

<u>Explanation: </u>

As it is stated about the wave propagates in the given question, the first thing to confirm is the wave should be a mechanical wave as electromagnetic wave will not penetrate the suspension bridge.

Then as both the pavements and girders are rigid structures present in suspension bridge, the wave can propagate in them which are forming compressions and rarefactions.

The transverse waves cannot pass through them because of the polarization property of transverse waves. Also as they propagate in compression and rarefactions mode, the particles will tend to vibrate only in perpendicular direction to that of the wave propagation. So, the last statement is only true.

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For a distant astronomical object (a quasar) is moving away from us at half the speed of light, the speed of the light we receive from this quasar  is mathematically given as c = 3x108 m/s

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The speed of light can be said to be measured to be approximately the value c = 3x108 m/s

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