3 years ago

20. I am a noble gas with 2 electrons.

Physics

1 answer:

madam [21]3 years ago

8 0

Answer:

20.helium

21.silicon

hope this helps :)

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A positively charged atom has _____. lost electrons lost protons gained electrons gained protons

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A positively charged atoms has lost electrons.

Electron are easy to remove from the atom, electron are of negative charge. Initially atom is neutral that is the charge of electron is equal to the charge of the proton, when atom loose some of its electron, the net charge of electrons is less than the net charge of the Protons, which makes the atom positively charged.

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Find the total displacement of a mouse that travels 1.0m north and then 0.8m south.

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In this case two vectors are colinear and they have an opposite orientation.
N + ( - S ) = N - S = 1 m - 0.8 m = 0.2 m
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You are standing on a sheet of ice that covers the football stadium parking lot in Buffalo; there is negligible friction between

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Explanation:

Given that,

Mass of ball, m = 0.425 kg

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Mass of a person, m' = 68 kg

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$mu+m'u'=(m+m')V\\\\V=\dfrac{mu+m'u'}{(m+m')}\\\\V=\dfrac{0.425\times 12+0}{(0.425+68)}\\\\V=0.0745\ m/s$

(b) If the ball hits the person and bounces off his chest, so afterwards it is moving horizontally at 9.00 m/s in the opposite direction,. Let v' is the speed of the person after the collision. So,

$mu+m'u'=mv+m'v'$

v = -9 m/s

$mu=mv+m'v'\\\\v'=\dfrac{m(u-v)}{m'}\\\\v'=\dfrac{0.427\times (12-(-9))}{68}\\\\v'=0.131\ m/s$

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A. Twice as slow

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