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Answers
17. The weight is the gravitational force with which a body is attached to the Earth (planet/moon) Weight of any object on earth depends on two factors mass and gravitational constant. As per law, W = mg where, g is gravitational constant 9.8 m/s/s Eg.
18. As you move towards the higher altitude your weight changes but the mass remains the same. This happens because the gravitational pull varies subtly as you move around the surface of the Earth, as the altitude and topology also varies. So generally due to this reason weight is lower as we move to the mountains as compared to when we standing at the sea level.
19. As you travel away from the Earth's surface, your mass stays the same but your weight reduces as gravitational pull decreases.
For example, an astronaut orbiting the Earth and floating weightlessly in the cabin still has the same mass. If it were possible to put them on scales in that situation they would be the same number of kilograms as they were on Earth. However their weight in Newtons would have reduced.
When you're standing on Earth you experience weight because you've got the ground pushing up against your feet.
The experience of weight is through that counteracting force of the ground pushing back on you as you're pushing down on the ground, because gravity is pulling you down. If you're in a spaceship you don't feel weight because you don't have the ground pushing up against you.
Gravitational pull will also change subtly as you move around the surface of the Earth, varying with latitude and local topology, as the Earth is not a perfect sphere. But generally speaking, gravitational pull, and therefore weight, is lower on a mountain than at sea level.
20. All the objects on Earth, experience an acceleration of 9.8 m/s^2 on them due to Gravity. Since, weight is also a force, the formula to calculate Weight is same as that of calculating any force.
∴ Weight = 10 kg * 9.8 m/s^2.
∴ Weight = 98 kg.m/s^2.