Question

If you have to purchase 100 kg weight of gold, which place would you prefer the Earth –Moon? Similarly, if you have to sell gold, which place you prefer- The earth or moon? Explain
A) Earth, Moon
B) Moon, Moon
C) Earth, Earth
D) Moon, Earth

Answer 1

Hint: Earth and moon have different gravitational force of attraction. Gravitational force of the earth is higher than that of the moon. Since, the weight of an object depends on gravity, the same mass of objects weighs differently in the earth and the moon. Hence, a 100 kg of gold weighs differently on the earth and the moon.

Complete answer:
The earth and the moon have a great difference in their masses. Compared to the earth the moon has less gravitational force. The moon’s gravity is weaker because it is far less massive than the earth. A body’s gravity is directly proportional to its mass. Hence, objects weigh less in the moon, compared to earth. Therefore, a 100 kg weight of gold on the moon requires more mass to equal the weight on earth. Thus, a person gets more mass of gold on the moon. Similarly, due to high gravitational force compared to the moon, a 100 kg of gold in earth weighs more than the 100 kg in the moon. Hence, gold must be purchased on the moon and sold on earth.

Answer is option D.

Note:
Mass of a body is the measure of how much matter an object contains, and weight is the measure of the force of gravity on the body. An object has the same composition, and therefore, mass is the same for an object in all locations. Since, a body’s gravity is directly proportional to its mass, if a body has less mass, its gravity will be less and vice versa.