The only thing we know of so far that can shift light to longer wavelengths is the "Doppler" effect. If the source and the observer are moving apart, then the observer sees wavelengths that are longer than they should be. If the source and the observer are moving toward each other, then the observer sees wavelengths that are shorter than they should be. It works for ANY wave ... sound, light, water etc. The trick is to know what the wavelength SHOULD be. If you know that, then you can tell whether you and the source are moving together or apart, and you can even tell how fast. If the lines in a star"s spectrum are at wavelengths that are too long, then from everything we know right now, the star and Earth are moving apart.
<span>-2,5SD = 2.1%
</span>first u need to find number of standard deviations and look up on table what percentage that is
Answer:
Then its acceleration is zero.
Explanation:
Velocity → Uniform → Constant
→ Change in Velocity = 0
A= = (v=m)
a=0
Answer:
Explanation:
Since the centripetal force F_C is, in this case, the gravitational force F_G exerted by the planet, we can say that:
In the case of the satellite A we have:
And in the case of the satellite B:
Finally, using these two expressions, we obtain :
In words, the centripetal acceleration a_b is equal to one fourth of a_0.