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3 years ago

12

What do you spiral and elliptical galaxies have in common

1 answer:

malfutka [58]3 years ago

3 0

They have a uniform luminosity and are similar to the bulge in a spiral galaxy, but with no disk. The stars are old and there is no gas present. Ellipticals are usually found in the high density field, at the centre of clusters.

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Objects with unlike charges what each other

DerKrebs [107]

The answer is attract. Hope it helps! :)

6 0

3 years ago

Read 2 more answers

List two types. Of organelles

Helen [10]

Theres: the vacuole, nucleus, rough endoplamid reticulum, smooth endoplasmic reticulum, cell memebrane, cell wall, chloroplast, mitochondria, golgi apperatus, lysosomes, and ribosomes

6 0

3 years ago

A 0.5 kg mass on a spring undergoes simple harmonic motion with a total mechanical energy of 12 J. If the oscillation amplitude

Darya [45]

Answer:

The frequency of the oscillation is 2.45 Hz.

Explanation:

Given;

mass of the spring, m = 0.5 kg

total mechanical energy of the spring, E = 12 J

Determine the spring constant, k as follows;

E = ¹/₂kA²

kA² = 2E

k = (2E) / (A²)

k = (2 x 12) / (0.45²)

k = 118.519 N/m

Determine the angular frequency, ω;

$\omega = \sqrt{\frac{k}{m} } \\\\\omega = \sqrt{\frac{118.519}{0.5} } \\\\\omega = 15.396 \ rad/s$

Determine the frequency of the oscillation;

ω = 2πf

f = (ω) / (2π)

f = (15.396) / (2π)

f = 2.45 Hz

Therefore, the frequency of the oscillation is 2.45 Hz.

8 0

2 years ago

In the nucleus ______________<br> tell cells what to do and how to change.

anyanavicka [17]

Answer:

i believe it is dna

Explanation:

if i remember correctly if the dna tells the cell what to do and how to do it

7 0

3 years ago

Calculate the recombination rate if the excess carrier concentration is 1014cm-3 and the carrier lifetime is 1usec. (a) 108 (b)

Drupady [299]

Answer:

$10^{20}\frac{cm^{-3}}{sec}$

Explanation:

The recombination rate is denoted by R it is the ratio of excess carrier concentration and life time

The recombination rate R is given by $R=\frac{\Delta n}{\tau _n}$

We have given excess carrier concentration = $10^{14}cm^-3$

Life time $\tau _n=10^{-6}sec$

So recombination rate $R=\frac{\Delta n}{\tau _n}=\frac{10^{14}}{10^{-6}}=10^{20}\frac{cm^{-3}}{sec}$

5 0

3 years ago