7.Gravitation
medium

यदि पृथ्वी की त्रिज्या $R$ है एवं $g$ उसके तल पर गुरुत्वीय त्वरण है तो पृथ्वी का माध्य घनत्व है

A

$4\pi G/3gR$

B

$3\pi R/4gG$

C

$3g/4\pi RG$

D

$\pi RG/12G$

Solution

$g = \frac{{GM}}{{{R^2}}}$ तथा $M = \frac{4}{3}\pi {R^3} \times D$

$\therefore \,\,g = \frac{4}{3}\frac{{\pi {R^3} \times GD}}{{{R^2}}}\, \Rightarrow \,D = \frac{{3g}}{{4\pi RG}}$

Standard 11
Physics

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