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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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A theory can help create a model
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4 years ago
Toy car in a science experiment covers 1.6 meters in half a second. If a the car travels at a steady speed, how far will it go i
Tanzania [10]
The answer is D. 32 m.

The simple equation that connects speed (v), time (t), and distance (d) can be expressed as:
v= \frac{d}{t}         ⇒ d=v*t

It is given:
v =  \frac{1.6m}{0.5s} = \frac{1.6m*2}{0.5s*2}= \frac{3.2m}{1s}  = 3.2 m/s
t = 10 s
d = ?

So:
d= v*t=3.2m/s*10s = 32m
3 0
3 years ago
An acorn falls from a tree and hits the ground in 0.8 s. How far did the acorn fall . Use g = 9.8 m/s^2. Round your final result
mylen [45]

The distance covered by the acorn is 3.136 m.

<u>Explanation:</u>

The time taken for the acorn to hit the ground is 0.8 s. As it is a free fall, the acorn will be completely under the influence of gravity. So the acceleration will be acceleration due to gravity.

Then using the second law of equation,

s=ut+\frac{1}{2}gt^{2}

Since the initial velocity and time is zero, then the time taken to reach the ground is stated as 0.8 s, so

   s=0+\left(\frac{1}{2} \times 9.8 \times 0.8 \times 0.8\right)=\frac{6.272}{2}=3.136 \mathrm{m}

So the distance covered by the acorn is 3.136 m.

8 0
3 years ago
Two automobiles of equal mass approach an intersection. One vehicle is traveling with velocity 14.0 m/s toward the east and the
Sergeeva-Olga [200]

Answer:

kqwwwwj

Explanation:

4 0
3 years ago
A small particle starts from rest from the origin of an xy-coordinate system and travels in the xy-plane. Its acceleration in th
CaHeK987 [17]

Answer:

The x-coordinate of the particle is 24 m.

Explanation:

In order to obtain the x-coordinate of the particle, you have to apply the equations for Two Dimension Motion

Xf=Xo+Voxt+0.5axt²(I)

Yf=Yo+Voyt+0.5ayt² (II)

Where Xo, Yo are the initial positions, Xf and Yf are the final positions, Vox and Voy are the initial velocities, ax and ay are the accerelations in x and y directions, t is the time.

The particle starts from rest from the origin, therefore:

Vox=Voy=0

Xo=Yo=0

Replacing Yf=12, Yo=0 and Voy=0 in (I) and solving for t:

12=0+(0)t+ 0.5(1.0)t²

12=0.5t²

Dividing by 0.5 and extracting thr squareroot both sides:

t=√12/0.5

t=√24 = 2√6

Replacing t=2√6, ax=2.0,Xo=0 and Vox=0 in (I) to obain the x-coordinate:

Xf=0+0t+0.5(2.0)(2√6)²

Xf= 24 m

5 0
3 years ago
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