JEE Mains · Physics · STD 11 - 7. gravitation
A \(90 \mathrm{~kg}\) body placed at \(2 \mathrm{R}\) distance from surface of earth experiences gravitational pull of _______. ( \(\mathrm{R}=\) Radius of earth, \(\mathrm{g}=10 \mathrm{~ms}^{-2}\) )
- A \(300 \mathrm{~N}\)
- B \(225 \mathrm{~N}\)
- C \(120 \mathrm{~N}\)
- D \(100 \mathrm{~N}\)
Answer & Solution
Correct Answer
(D) \(100 \mathrm{~N}\)
Step-by-step Solution
Detailed explanation
Value of \(g=g_5\left(1+\frac{h}{R}\right)^{-2}\) \(=\mathrm{g}_5(1+2)^{-2}=\frac{\mathrm{g}_5}{9}\) Here \(\mathrm{g}, \mathrm{g}\) gravitational acceleration at surface \(\text { Force }=m g=90 \times \frac{g_5}{9}=100 \mathrm{~N}\)
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