7.Gravitation
medium

જો પૃથ્વીની ત્રિજ્યા $6347\;km$ હોય તો મુક્ત પતનનો પ્રવેગ અને પૃથ્વીની સપાટી પર ગુરુત્વપ્રવેગ વચ્ચેનો તફાવત શું હશે?

A

$0.0340$

B

$0.3400$

C

$0.00334$

D

$0.24$

(AIIMS-2019)

Solution

The expression acceleration due to gravity near the earth surface is given by,

$g =\frac{ GM }{ R ^{2}}$

$=9.8$

The expression acceleration of free fall is given by,

$g _{\text {froe } fall }=\frac{ GM }{ R ^{2}}-\omega^{2} R$

$=9.8-\omega^{2} R$

Solve the difference as follows.

$g – g _{\text {free fill }}=\omega^{2} R$

$=\left(\frac{2 \pi}{ T }\right)^{2} R$

$=\frac{4 \pi^{2}}{(24 \times 60 \times 60)^{2}} \times 6347 \times 10^{3}$

$=0.03401$

Standard 11
Physics

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