Explanation:
An electrified comb is charged comb ( let say by running it through the hair) and when it is brought in the proximity of pieces of paper, the pieces tend to cling to it. This happens because the charged comb induces an opposite charge in the paper pieces and as opposite charges attract each other, the pieces are clinged.
The distance D where the object comes to rest is 1.08.m.
<h3>What is the distance?</h3>
- The separation of one thing from another in space; the distance or separation in space between two objects, points, lines, etc.; remoteness. The distance of seven miles cannot be accomplished in one hour of walking.
- Learn how to use the Pythagorean theorem to get the separation between two points using the distance formula. The Pythagorean theorem can be rewritten as d==(((x 2-x 1)2+(y 2-y 1)2)
- The distance between any two places is the length of the line segment separating them. By measuring the length of the line segment that connects the two points in coordinate geometry, the distance between them may be calculated.
(c) the distance D where the object comes to rest.
ΔKE ⇒ -0.25*1*9.8*D = 0-1/2*1*![2.3^{2}](https://tex.z-dn.net/?f=2.3%5E%7B2%7D)
⇒![D=\frac{0.5*2.3^{2} }{2.45}](https://tex.z-dn.net/?f=D%3D%5Cfrac%7B0.5%2A2.3%5E%7B2%7D%20%7D%7B2.45%7D)
⇒1.08.m
To learn more about distance, refer to:
brainly.com/question/4998732
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Answer:
![I_{2}=0.27 W/m^2](https://tex.z-dn.net/?f=I_%7B2%7D%3D0.27%20W%2Fm%5E2)
Explanation:
Intensity is given by the expresion:
![I_{2}=Io (\frac{r1}{r2} )^{2}](https://tex.z-dn.net/?f=I_%7B2%7D%3DIo%20%28%5Cfrac%7Br1%7D%7Br2%7D%20%29%5E%7B2%7D)
where:
Io = inicial intensity
r1= initial distance
r= final distance
![I_{2}=10 W/m^2 (\frac{30m}{180m} )^{2}](https://tex.z-dn.net/?f=I_%7B2%7D%3D10%20W%2Fm%5E2%20%28%5Cfrac%7B30m%7D%7B180m%7D%20%29%5E%7B2%7D)
![I_{2}=0.27 W/m^2](https://tex.z-dn.net/?f=I_%7B2%7D%3D0.27%20W%2Fm%5E2)