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Lorico [155]
3 years ago
6

If anyone could answer my question , please help -,- xD

Physics
2 answers:
gladu [14]3 years ago
6 0
Kinematics is the branch of mechanics concerned with the motion of objects without the reference to the forces which cause the motion.
Paraphin [41]3 years ago
5 0
Kinematics is the study of motion, without any reference to the forces that cause the motion. It basically means studying how things are moving, not why they're moving. It includes concepts such as distance or displacement, speed or velocity, and acceleration, and it looks at how those values vary over time.
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A star is moving towards the earth with a speed at 90% the speed of light. It emits light, which moves away from the star at the
AnnyKZ [126]

Answer:

The speed of light measured in any frame is c = 3.00E8 m/s.

This is one  of Einstein's  postulates of special relativity.

5 0
2 years ago
Which statement best describes an atom? (2 points)
alekssr [168]

Answer:

A group of protons and neutrons that are surrounded by electrons  I think that's the answer...

Explanation:

7 0
3 years ago
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Pube Goldberg machine is a complicated contraption designed to do a very simple task, like the one shown above
Elanso [62]

Answer:

I think is 2

Explanation:

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3 years ago
The sun appears to move through the background stars. This apparent motion would not exist if:_________.
otez555 [7]

Answer:

b) the earth did not orbit the sun

Explanation:

The sun appears to move through the background stars due to parallax . Parallax is a phenomenon when the near object appears to move faster than the distant object . If we travel in a train , the near object like electric poles on rail track or trees and fields nearby appear to move faster against the distant background .

Hence when the earth moves around the sun , the sun appears to move against the background the stars which are far away . Had earth remained stationary at a place on its orbit around the sun , the sun would have appeared stationary against the background the   stars .

3 0
3 years ago
Five hundred joules of heat are added to a closed system. The initial internal energy of the system is 87 J, and the final inter
Aleonysh [2.5K]

We can solve the problem by using the first law of thermodynamics:

\Delta U= Q-W

where

\Delta U is the variation of internal energy of the system

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W is the work done by the system

In this problem, the variation of internal energy of the system is

\Delta U=U_f-U_i=134 J-87 J=47 J

While the heat added to the system is

Q=500 J

therefore, the work done by the system is

W=Q-\Delta U=500 J-47 J=453 J

5 0
3 years ago
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