Answer:
When a wad of gas and heavenly dust is small and thick enough, gravity plays a epic role into turning that material into a new star.
Explanation:
Answer:
B- Velocity
Explanation:
This means gravity makes the Moon accelerate all the time, even though its speed remains constant.
If it would be lower - we would not have Antarctica and many species would extinct. Polar ice would melt and we will get a see in the middle of Australia. Sydney, Bri, Mel, Ade, Perth would be under water.
I believe that if you touch a metal sphere with a plastic straw, the straw would not have enough strength to push it. So in that case, the metal sphere will not move and will stay in one place.
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Answer:
![(a)\\1.97\times 10^8 m/s\\(b)\\1.99\times 10^8 m/s \\(c)\\2.21 \times 10^8 m/s](https://tex.z-dn.net/?f=%28a%29%5C%5C1.97%5Ctimes%2010%5E8%20m%2Fs%5C%5C%28b%29%5C%5C1.99%5Ctimes%2010%5E8%20m%2Fs%20%5C%5C%28c%29%5C%5C2.21%20%5Ctimes%2010%5E8%20m%2Fs)
Explanation:
According to the definition of refractive index, the refractive index of the material is defined as the ratio of speed of light in vacuum to the speed of light in medium.
(a) refractive index, n = 1.52
![n=\frac {c}{v}\\\\1.52 = \frac{3\times 10^8}{v}\\\\v = 1.97\times 10^8 m/s](https://tex.z-dn.net/?f=n%3D%5Cfrac%20%7Bc%7D%7Bv%7D%5C%5C%5C%5C1.52%20%3D%20%5Cfrac%7B3%5Ctimes%2010%5E8%7D%7Bv%7D%5C%5C%5C%5Cv%20%3D%201.97%5Ctimes%2010%5E8%20m%2Fs)
(b) refractive index, n = 1.51
![n=\frac {c}{v}\\\\1.51 = \frac{3\times 10^8}{v}\\\\v = 1.99\times 10^8 m/s](https://tex.z-dn.net/?f=n%3D%5Cfrac%20%7Bc%7D%7Bv%7D%5C%5C%5C%5C1.51%20%3D%20%5Cfrac%7B3%5Ctimes%2010%5E8%7D%7Bv%7D%5C%5C%5C%5Cv%20%3D%201.99%5Ctimes%2010%5E8%20m%2Fs)
(c) refractive index, n = 1.36
![n=\frac {c}{v}\\\\1.36 = \frac{3\times 10^8}{v}\\\\v = 2.21\times 10^8 m/s](https://tex.z-dn.net/?f=n%3D%5Cfrac%20%7Bc%7D%7Bv%7D%5C%5C%5C%5C1.36%20%3D%20%5Cfrac%7B3%5Ctimes%2010%5E8%7D%7Bv%7D%5C%5C%5C%5Cv%20%3D%202.21%5Ctimes%2010%5E8%20m%2Fs)