Answer:
<em>a. Aristarchus</em> was the Greek scientist who concluded that the sun is the centre of the solar system, and that the Earth revolves around the Sun
Explanation:
<em>Aristarchus</em> was a Greek scientist who studied astronomy. He concluded that the sun is the centre of the solar system, and that the Earth revolves around the Sun (that it was Heliocentric).
I think the answer is C. The combined kinetic energy of both cars. I maybe wrong. I'm not sure.
Answer:
Distance travelled, d = 0.21 m
Explanation:
It is given that,
Initial velocity of electron, u = 500,000 m/s
Acceleration of the electron, a = 500,000,000,000 m/s²
Final velocity of the electron, v = 675,000 m/s
We need to find the distance travelled by the electron. Let distance travelled is s. Using third equation of motion as :
![v^2-u^2=2as](https://tex.z-dn.net/?f=v%5E2-u%5E2%3D2as)
![s=\dfrac{v^2-u^2}{2a}](https://tex.z-dn.net/?f=s%3D%5Cdfrac%7Bv%5E2-u%5E2%7D%7B2a%7D)
![s=\dfrac{(675000\ m/s)^2-(500000\ m/s^2)^2}{2\times 500000000000\ m\s^2}](https://tex.z-dn.net/?f=s%3D%5Cdfrac%7B%28675000%5C%20m%2Fs%29%5E2-%28500000%5C%20m%2Fs%5E2%29%5E2%7D%7B2%5Ctimes%20500000000000%5C%20m%5Cs%5E2%7D)
s = 0.205 m
or
s = 0.21 m
So, the electron will travel a distance of 0.21 meters. Hence, this is the required solution.
Answer:
Explanation:
In order to use a device rated for use in 240 volt for use in 120 V , we have to use a step down transformer . In step down transformer no of turn in secondary coil is less than that in primary coil .
For transformer the relation is as follows
V₂ / V₁ = N₂ / N₁ = turn ratio
Where V₂ and V₁ are volts in secondary and primary coil and N₂ and N₁ is no of turns in secondary and primary coil.
Here V₂ = 120V , V₁ = 240 V
turn ratio = N₂ / N₁ = V₂ / V₁ = 120 / 240 = .5
turn ratio = .5 .