Answer:
Please see attachment.
Explanation:
This just a question that I keep forgetting, are lightskin people black.??
2 answers:
You might be interested in
Answer:
The sum of all currents entering a junction is 0
Explanation:
Current cannot disappear, so the currents leaving a junction have to equal the currents entering a junction. If you would give the currents leaving the junction an opposite sign (e.g., negative) it implies that the sum of all these currents is exactly 0.
Answer:
<em>Heat is lost at the rate of 750 J/s or W</em>
<em>The thermal resistance is 1 K/W</em>
Explanation:
interior temperature = 900 °C
wall thickness t = 60 cm = 0.6 m
width = 1 m
breadth = 1.5 m
thermal conductivity k = 0.4 W/m-K
outside temperature = 150 °C
heat through the wall = ?
The area of the wall A = w x b = 1 x 1.5 = 1.5 m^2
Temperature difference =
-
= 900 - 150 = 750 °C
note that is also equal to 750 K since to convert from °C to K we'll have to add 273 to both temperature, which will still cancel out when we subtract the two temperatures.
To get the heat that escapes through the wall, we use the equation
Q = Ak
substituting values, we have
Q = 1.5 x 0.4 x = <em>750 J/s or W</em>
Thermal resistance =
= 750/750 =<em> 1 K/W</em>