Tag: evs - ii

Radius of Saturn is about $9$ times than that of earth.

Twilight is seen because the earth's atmosphere, some light scatters through small particles in the atmosphere- so, there is still some light n the sky even after the sun  has gone down.

Superior planets are those planets which is farther from the earth than the Sun. Except Mercury and Venus rest are superior planets.

Mass of the planet jupiter is about $318$ times than that of earth.

Jupiter is the largest planet in the universe its diameter is about $1.3\times { 10 }^{ 5 }$km.

First of all venus is very close to earth so very less amount of light gets scattered by atmosphere particles and second thing is it reflects $75\%$ of the light coming from sun.

According to recent astronomical data pluto is the planet which is at the farthest distance from earth.

A planet signs because it reflects the light coming from the sun.

The smallest planet in the solar system is  mercury.

Surface gravity of different planets has a unique surface gravity.
Newton's second law of motion: $F=ma$............(1)
Law of universal gravitation: $F _g=\dfrac{GM _1M _2}{R^2}$............(2)
The value of $G$ was originally determined experimentally by Henry Cavendish and has a value of $6.67\times10^{11} N m^3/kgs^{2}$
By using these two equations, one can derive another equation that shows the acceleration due to gravity at the surface of a planet, i.e., $g=\dfrac{GM}{R^2}$
Where $M$ is the mass of the planet and $R$ is its radius.
The surface gravity of the planets, as determined by the equation above and shown relative to Earth's gravity can be seen below:

Object:           g/g-earth:       Acceleration at the surface

Earth...............$1.0$...............$g = 9.78\ m/s^2$ ($32.1\ ft/s^2$)

Jupiter.............$2.36$...........$g = 23.1\ m/s^2$ ($75.9\ ft/s^2$)

Saturn.............$1.07$.............$g = 9.05\ m/s^2$($29.4\ ft/s^2$)

Uranus............$0.889$...........$g = 8.69\ m/s^2$($28.5\ ft/s^2$)

Neptune..........$1.12$.............$g = 11.0\ m/s^2$($36.0\ ft/s^2$)

So, surface gravity of different planets in correct decreasing order is Jupiter, Neptune, Saturn, Earth.