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Question

The weight of a body on the moon is 3 N. What will be the weight of the body on Earth?

The correct answer is
18 N

Understanding Weight Variation: Moon vs. Earth

The question asks to find the weight of a body on Earth, given its weight on the Moon.

Key Concept: The gravitational pull on Earth is approximately 6 times stronger than the gravitational pull on the Moon. Therefore, a body's weight on Earth is about 6 times its weight on the Moon.

Calculating Earth Weight from Moon Weight

Let $W_{moon}$ be the weight of the body on the Moon and $W_{earth}$ be the weight of the body on Earth.

Given:

  • $W_{moon}$ = 3 N

The relationship between weight on Earth and Moon is:

$ W_{earth} \approx 6 \times W_{moon} $

Substitute the given value:

$ W_{earth} \approx 6 \times 3 \, \text{N} $

$ W_{earth} \approx 18 \, \text{N} $

Thus, the weight of the body on Earth will be approximately 18 N.

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Important Questions from Gravitation

  1. Which one of the following statement is true for the relation, \(F= \frac{{G{m_1}{m_2}}}{{{r^2}}}\) ?

    (All symbols have their usual meanings)
  2. Suppose there are two planets, 1 and 2, having the same density but their radii are R 1and R 2respectively, where R 1> R 2. The accelerations due to gravity on the surface of these planets are related as

  3. LIGO stands for

  4. If radius of the earth were to shrink by 1%, its mass remains the same, g would decrease by nearly

  5. The radius of the Moon is about one-fourth that of the Earth and acceleration due to gravity on the moon is about one-sixth that on the earth. From this, we can conclude that the ratio of the mass of earth to the mass of the moon is about

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