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elena-s [515]
3 years ago
9

Quasar spectra often show many absorption lines that all appear to be as a result of the same electron transition (such as level

1 to level 2 in hydrogen) but that fall at different wavelengths in the spectrum. Why do we think this is the case?
Physics
1 answer:
Elanso [62]3 years ago
5 0

Answer: Because of different redshift of cloud.

Explanation:

We are seeing absorption lines from clouds of gas that lie between us and the quasar, and therefore each cloud has a different redshift.

A quasar's spectrum is hugely redshifted. And most astronomers think this large redshift tells us about the distance to the quasar.

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0.10-kilogram model rocket’s engine is designed to deliver an impulse of 6.0 newton-seconds. If the rocket engine burns for 0.75
UkoKoshka [18]

Answer:

8.0 N

Explanation:

Force: This can be defined as the mass of a body and its acceleration. The S.I unit of Force is Newton (N).

Mathematically, Fore is expressed as

F = ma ........................... equation 1

Where F = force, m = mass, a = acceleration.

and

I = mΔv

Δv = I/m ............................ Equation 2

Where I = impulse, m = mass, Δv = change in velocity

Given: I = 6.0 Newton-seconds, m = 0.1 kilogram.

Substituting into equation 2

Δv = 6.0/0.1

Δv = 60 m/s.

But

a = Δv/t

where t = time = 0.75 seconds.

a = 60/0.75

a = 80 m/s²

Substitute the values of a and m into equation 1.

F = 0.1(80)

F = 8.0 N.

Thus the average force produced = 8.0 N

6 0
3 years ago
If an object has an increasing positive acceleration, what can we assume about the forces on it?
Nesterboy [21]

Answer:

F = M a    is a vector equation

F has the same sign as A and is in the same direction as the vector a

If a is positive then F must also be positive

6 0
3 years ago
Two identical metal balls a and b are mounted on insulating rods. Ball a has a charge of +q/2 and ball b is initially uncharged.
oksano4ka [1.4K]

Answer:

Help me please?

Explanation:

Did you get the answer? I believe it’s either C. +q or D. 0

6 0
3 years ago
Read 2 more answers
Describe the 3 main components of work.
nadezda [96]
Work is Force x Distance in the Direction of the force.
3 0
3 years ago
PLEASE HELP!!!!!!
Dafna11 [192]
VF=0
Vi=60mph
T=4.0s

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7 0
3 years ago
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