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3 years ago

8

Compared to a stationary galaxy, light from a galaxy that is moving away from earth will appear _____.

2 answers:

Vlad1618 [11]3 years ago

3 0

"B" When an object moves away from us, the light is shifted to the red end of the spectrum, as its wavelengths get longer.

nikklg [1K]3 years ago

3 0

Answer:

B) Redder

Explanation:

Think of it like this; a car passes by you, as it goes, it's horn gets louder, and then starts to become quieter as it moves further away. Redshift works the same way. When an galaxy starts to move away from Earth, it's light <em>appears </em>to be redder. (If it was moving closer to Earth, it would most likely become bluer.)

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A cannon fires a shell straight upward; 2.3 s after it is launched, the shell is moving upward with a speed of 17 m/s. Assuming

PtichkaEL [24]

Answer:

The speed of the shell at launch and 5.4 s after the launch is 13.38 m/s it is moving towards the Earth.

Explanation:

Let u is the initial speed of the launch. Using first equation of motion as :

$u=v-at$

a=-g

$u=v+gt\\\\u=17+9.8\times 2.3\\\\u=39.54\ m/s$

The velocity of the shell at launch and 5.4 s after the launch is given by :

$v=u-gt\\\\v=39.54-9.8\times 5.4\\\\v=-13.38\ m/s$

So, the speed of the shell at launch and 5.4 s after the launch is 13.38 m/s it is moving towards the Earth.

6 0

3 years ago

PLEASE HELP!!!! Which is the best example of a non-inertial frame of reference? (1 point)

Sergeu [11.5K]

Answer: B

Explanation:

A - No, because this has nothing to do with curves

B - Yes, because it explains gravity and it it forced down by gravity

C - No, because this has nothing to do with a rocket ship an dhow much it can travel per #.

D - No, because This has nothing to do with a boat on water and it explain nothing about gravity or how fast it is.

I Hope This Helped!

8 0

3 years ago

A 1350 kg car travels at 12 m/s. What is it's kinetic energy

Lana71 [14]

Hello!

A 1350 kg car travels at 12 m/s. What is it's kinetic energy ?

We have the following data:

m (mass) = 1350 kg

v (velocity) = 12 m/s

KE (kinetic Energy) = ? (in Joule)

Formula to calculate kinetic energy:

$\boxed{KE = \dfrac{1}{2} *m*v^2}$

Solving:

$KE = \dfrac{1}{2} *m*v^2$

$KE = \dfrac{1}{2} *1350*12^2$

$KE = \dfrac{1}{2} *1350*144$

$KE = \dfrac{194400}{2}$

$\boxed{\boxed{KE = 97200\:Joule}}\:or\:\boxed{\boxed{KE = 97.2\:kJ}}\Longleftarrow(kinetic\:energy)\:\:\:\:\:\:\bf\blue{\checkmark}$

_______________________

$\bf\green{I\:Hope\:this\:helps,\:greetings ...\:Dexteright02!}\:\:\ddot{\smile}$

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