Question

The gravity of Neptune is about 1.1 times the gravity of Earth. How will the mass of an object on Neptune compare with its mass on Earth?

Answer 1

Answer:

The mass of an object remains same everywhere

Explanation:

The mass of an object is equal to amount of matter contained in it and therefore it remains constant everywhere.

However, it is the weight of an object that varies with the gravity.

Weight of an object $= M * g$

Where "M" represents the mass of an object in Kg

and "g" represents the acceleration due to gravity in $\frac{m}{s^{2} }$

Now, if on earth mass of an object is 100 Kg, then its mass on neptune will also be 100 Kg.

But weight of the same object on earth would be

$100 * 9.8\frac{m}{s^{2} } \\= 980 \frac{Kg-m}{s^{2} }$

Since gravity of Neptune is $1.1$ times the gravity of earth, its gravitational constant g would be equal to $1.1 * 9.8 \frac{m}{s^{2} }$

Therefore, weight of this object on Neptune will be equal to $100 * 1.1* 9.8\frac{m}{s^{2} } \\= 1078 \frac{Kg-m}{s^{2} }$

Answer 2

Neptune is a gas planet, so it doesn’t have a solid surface. If you tried to walk on the surface of Neptune, you’d sink right in. But let’s say you could walk on Neptune. How strong is the gravity on Neptune? How heavy would you feel?

The surface gravity of Neptune is 1.14 times the gravity on Earth. In other words, if you could actually walk on Neptune, you would feel only a little heavier than if you were walking on Earth. If you weighed 100 kg on Earth, you would weight 114 kg on Neptune. Compare that to the much lower gravity you would feel on the Moon (16.5%) or Mars (37.6%).

Neptune has much more mass than Earth. In fact, it has a mass of 17 times the mass of the Earth. You would think that would make the gravity much more extreme. But it also has a much larger size. The diameter of Neptune is 3.8 times the diameter of Earth. This brings the gravity on Neptune down to a very comfortable 114% the gravity of Earth.

Except for the non-solid part, walking on Neptune would feel very comfortable.