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Effectus [21]
2 years ago
14

What a Cell Wall can some tell me

Physics
1 answer:
Svet_ta [14]2 years ago
5 0

Answer:

cell membrane

Explanation:

A cell wall is most commonly known as a cell membrane witch just controls what can go in and out of a cell .

( hope this helped )

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Two balloons are charged with an identical quantity and type of charge: -6.25 x 10-6 C. They are held apart at a separation dist
steposvetlana [31]

Answer:

The electric force between them is 878.9 N

Explanation:

Given:

Identical charge q = -6.25 \times 10^{-6}C

Separation between two charges r = 0.02 m

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According to the coulomb's law

   F = \frac{k q^{2} }{r^{2} }

Here, force between two balloons are repulsive because both charges are same.

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   F = \frac{9 \times 10^{9} \times (-6.25 \times 10^{-6} )^{2}  }{4 \times 10^{-4} }

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8 0
3 years ago
A particular galaxy is observed to have a recessional velocity (away from Earth) of 30,000 km/s. Assuming the Hubble constant to
Yakvenalex [24]

Answer: 428.57 Mpc

Explanation:

Hubble deduced that the farther the galaxy is, the more redshifted it is in its spectrum, and noted that all galaxies are "moving away from each other with a speed that increases with distance", and enunciated the now called Hubble–Lemaître Law.  

This is mathematically expressed as:

V=H_{o}D (1)

Where:

V=30,000 km/s is the recession velocity of the galaxy

H_{o}=70 km/s/Mpc is the Hubble constant  

D is the distance

Isolating D from (1):

D=\frac{V}{H_{o}} (2)

D=\frac{30,000 km/s}{70 km/s/Mpc} (3)

Finally:

D=428.57 Mpc

3 0
3 years ago
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