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olga2289 [7]
3 years ago
15

Which group number is aluminum in?

Physics
2 answers:
coldgirl [10]3 years ago
8 0

Answer:

13

Explanation:

Tatiana [17]3 years ago
6 0

Answer:

13

Explanation:

on the periodic table you can find it under the abbreviation AI

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The focal length of david's lens is 60 cm. if rebecca stands in front of david at a distance of do and david perceives the posit
Makovka662 [10]

if rebecca stands in front of david at a distance of do and david perceives the position of rebecca at di, di will be +84 cm

<h3>What is focal length ?</h3>

How strongly light converges or diverges depends on an optical system's focal length, which is the inverse of optical power. A system with a positive focus length is said to converge light, whereas one with a negative focal length is said to diverge light.

focal length = +60 cm

magnification m = -0.40

focal length being positive an magnification negative.

given lens is a convex lens.

for a lens

m = di/do and 1/f = (1/di) - (1/do)di

= -0.4do1/f = (1/-0.4do) - 1/do do

= -210 cmdi = -0.4 * -210

di = +84 cm

To learn more about focal length go to - brainly.com/question/25779311

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What is the speed of a helicopter that traveled 1200 miles in 7 hours
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1200
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