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Weight and Mass of a Body

The weight of...

Question

The weight of a body at a specific place is $20 N$ . The acceleration due to gravity at that point is $10 m s^{- 2}$ . What is the mass and weight of the object at the centre of Earth?

2 k g, 0 N

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2 k g, 20 N

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2 k g, 2 N

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2 k g, 10 N

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Solution

The correct option is A $2 k g, 0 N$
Given,
Weight, $W = 20 N$ ,
Acceleration due to gravity $g = 10 m s^{- 2}$
Weight is given by: $W = m g$
where $m$ is the mass of the body.
$m = \frac{20}{10} k g = 2 k g$

Mass is the measure of the amount of substance in a body. It remains same all over the universe.

Weight varies as per acceleration due to gravity. Acceleration due to gravity at the center of earth is zero and hence, weight at the center of earth is also zero.

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The weight of a body at a specific place is 20 N. The acceleration due to gravity at that point is 10 ms−2. What is the mass and weight of the object at the centre of Earth?

The weight of a body at a specific place is $20 N$ . The acceleration due to gravity at that point is $10 m s^{- 2}$ . What is the mass and weight of the object at the centre of Earth?