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yarga [219]
4 years ago
8

Which of the following would likely be the best reflector of heat energy

Physics
1 answer:
Alex73 [517]4 years ago
4 0
If these are the missing choices: 
<span>A. gritty navy blue surface.
B. bumpy red surface.
C. dull orange surface.
D. Polished pale yellow surface.

My answer: D. Polished pale yellow surface

I read an article that summarized the results of the emission of radiation experiments. It stated the following:
1) </span>Black surfaces are the best emitters of heat radiation.
2) Black surfaces are the best absorbers of heat radiation.
3) Shiny surfaces are the best reflectors of heat radiation.
4) Shiny surfaces are poor absorbers of heat radiation.
<span>5) Glass will not transmit long wave infra red radiation.

Because of the above summary, that is why I arrived at the answer D. Polished pale yellow surface would likely be the best reflector of heat energy.</span>
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The charge density of radius 12.0 cm isgiven by with a = 1.40 μC/m 3 and r ismeasured radially outward from theorigin. What is t
Zigmanuir [339]

Answer:

The electric potential of the uniformly charge disk is 1392.1 V

Explanation:

Electric potential, for a uniformly charged disk at a distance A, is given as;

V = \frac{\sigma}{2 \epsilon} [\sqrt{A^2 +R^2} -A]

Where;

σ is the charge density = 1.40 μC/m³

ε is the permittivity of free space = 8.85 x 10⁻¹²

A is the distance above the disk = 40 cm = 0.4 m

R is the radius of the disk = 0.12 m

Substitute in these values into the equation above, we will have

V = \frac{1.4 X 10^{-6}}{2X8,85X10^{-12}}[\sqrt{0.4^2 +0.12^2}-0.4] \\\\V = (79096.05)(0.0176) = 1392.1 V

Therefore, the electric potential of the uniformly charge disk is 1392.1 V

3 0
3 years ago
Why is the mass of an atom's electrons not included in the atom's mass number?
Katen [24]

Answer: A: the electrons move so fast that their mass cannot be measured

Explanation: because they are so fast  scientist and other people cannot measure them

8 0
3 years ago
PLEASE HELP I can't figure it out
PSYCHO15rus [73]
D. I know that like the back of my hand
4 0
4 years ago
Why do sound waves move faster through the ground than through the air? a. Particles of matter are packed more loosely in the gr
lbvjy [14]
B. is it i just got done this in class like two weeks ago hope it helps

5 0
3 years ago
Read 2 more answers
A large truck is crossing a bridge 1 mile long. The bridge can only hold 14000 lbs, which is the exact weight of the truck. The
klasskru [66]
Depends on the weight of the bird.
1) Half a mile is about 800m.
2) 14000 lbs = about 6 tones, same like couple 4WD
3) Fuel consumption is about 20L per 100km or 0.2l each 1km or 0.16L within 800m
4) density of fuel is about 70% of density of water so .... weight of 1.6L of fuel burned would be about 1.6*0.7=1.1 kg

So if birds mass would be below 1 kg - the bridge will not collapse. But if it would be a pelican with the mass of 9kg - it would be a drama :)


  
8 0
3 years ago
Read 2 more answers
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