Q.

The average density of the earth in terms of g,G  and R   is:


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a

4πGR 3g   

b

3g 4πGR   

c

3g 4πG R 2   

d

4πG R 2 3g   

answer is B.

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Detailed Solution

Concept: At sea level, gravity acceleration is the acceleration of a body falling freely under the influence of the Earth's gravitational force. It is roughly equal to 9.8m/s2. Its measured value changes slightly with latitude (because of earth's rotation) and longitude (due to earth's non-spherical form) , as well as depth and height from the earth's surface.
The gravitational constant Question Image is given as:
Question Image(WhereQuestion Imageis the volume of the earth ) Question ImageSo, the average density of the earth in terms of g, G and Question Image is Question ImageHence, the correct option is 2.
 
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