Question

The weight of an object at the centre of the Earth of radius R is *​

Answer 1

Answer:

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A vendor buys oranges at Rs 26 per dozen and sells them at 5 for Rs. 13 Find the gain percent

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Solution

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Cost price of oranges are given as Rs.26/-per dozen

Selling price of 5 oranges =Rs.13

Therefore, selling price of oranges= 13/5

Seling price of 12 oranges =

5

13

×12=Rs.31.20 per dozen

Selling price of oranges >cost price of oranges.

So, gain occurs.

Gain on selling a dozen of oranges =S.P−C.P.=31.20−26=5.20

Gain% =Gain×100=5.2×100=52×100=20 %

Answer 2

Answer:

The weight of an object at the centre of the earth of radius R is zero.

The weight of an object is the maximum at the surface of the earth. As you move the body closer to the center of the earth, the mass of the earth between the center of the earth and the body keeps decreasing. This causes the force acting from the center of the earth on the body to decrease.