(C) The potential energy $U(r)$ is given by $U(r) = -\int_{\infty}^{r} F dr = -\int_{\infty}^{r} -\frac{GMm}{r^{2.1}} dr = GMm \int_{\infty}^{r} r^{-2

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$\sqrt{u^2 + \frac{2}{1.1} GM \left( \frac{1}{b^{1.1}} - \frac{1}{a^{1.1}} \right)}$

(C) The potential energy $U(r)$ is given by $U(r) = -\int_{\infty}^{r} F dr = -\int_{\infty}^{r} -\frac{GMm}{r^{2.1}} dr = GMm \int_{\infty}^{r} r^{-2.1} dr$.Evaluating the integral: $U(r) = GMm \left[ \frac{r^{-1.1}}{-1.1} \right]_{\infty}^{r} = -\frac{GMm}{1.1 r^{1.1}}$.By the law of conservation of energy: $K_i + U_i = K_f + U_f$.$\frac{1}{2}mu^2 - \frac{GMm}{1.1 a^{1.1}} = \frac{1}{2}mv^2 - \frac{GMm}{1.1 b^{1.1}}$.Dividing by $m/2$: $u^2 - \frac{2GM}{1.1 a^{1.1}} = v^2 - \frac{2GM}{1.1 b^{1.1}}$.Solving for $v$: $v^2 = u^2 + \frac{2GM}{1.1} \left( \frac{1}{b^{1.1}} - \frac{1}{a^{1.1}} \right)$.Thus,$v = \sqrt{u^2 + \frac{2}{1.1} GM \left( \frac{1}{b^{1.1}} - \frac{1}{a^{1.1}} \right)}$.

Class 11 Physics Gravitation Mix Examples-Gravitation

Difficult

$A$ satellite of mass $m$ is at a distance $a$ from a star of mass $M$. The speed of the satellite is $u$. Suppose the law of universal gravity is $F = -G \frac{Mm}{r^{2.1}}$ instead of $F = -G \frac{Mm}{r^2}$. Find the speed of the satellite when it is at a distance $b$ from the star.

A
$\sqrt{u^2 + 2GM \left( \frac{1}{b^{1.1}} - \frac{1}{a^{1.1}} \right)}$
B
$\sqrt{u^2 + GM \left( \frac{1}{a^{1.1}} - \frac{1}{b^{1.1}} \right)}$
C
$\sqrt{u^2 + \frac{2}{1.1} GM \left( \frac{1}{b^{1.1}} - \frac{1}{a^{1.1}} \right)}$
D
$\sqrt{u^2 + \frac{2}{2.1} GM \left( \frac{1}{b^{1.1}} - \frac{1}{a^{1.1}} \right)}$

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Gravitation

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Mix Examples-Gravitation

$A$ uniform sphere $A$ with radius $R$ exerts a force $F$ on a small particle $B$ situated at a distance $2R$ from the centre of the sphere. $A$ spherical portion of diameter $R$ is cut from the sphere $A$ as shown in the figure. If $F^{\prime}$ is the new gravitational force between the remaining part of the sphere $A$ and the particle $B$,then find the correct relation between $F$ and $F^{\prime}$.

MediumTS EAMCET 2022

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Which of the following symptoms is likely to afflict an astronaut in space? $(a)$ Swollen feet,$(b)$ Swollen face,$(c)$ Headache,$(d)$ Orientational problem.

Medium

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Take the mean distance of the moon and the sun from the earth to be $0.4 \times 10^6 \, km$ and $150 \times 10^6 \, km$ respectively. Their masses are $8 \times 10^{22} \, kg$ and $2 \times 10^{30} \, kg$ respectively. The radius of the earth is $6400 \, km$. Let $\Delta F_1$ be the difference in the forces exerted by the moon at the nearest and farthest points on the earth and $\Delta F_2$ be the difference in the force exerted by the sun at the nearest and farthest points on the earth. Then,the number closest to $\frac{\Delta F_1}{\Delta F_2}$ is

DifficultJEE MAIN 2018

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$A$ hemispherical shell of mass $2M$ and radius $6R$ and a point mass $M$ are performing circular motion due to their mutual gravitational interaction. Their positions are shown in the figure at any moment of time during motion. If $r_1$ and $r_2$ are the radii of the circular paths of the hemispherical shell and the point mass respectively,and $\omega_1$ and $\omega_2$ are the angular speeds of the hemispherical shell and the point mass respectively,then choose the correct option.

Difficult

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If the distance of Mercury from the Sun is $0.4$ times the distance of the Earth from the Sun,find the solar constant of Mercury in $cal/min \cdot cm^2$. The solar constant of the Earth is $2 \, cal/min \cdot cm^2$.

Difficult

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$A$ satellite of mass $m$ is at a distance $a$ from a star of mass $M$. The speed of the satellite is $u$. Suppose the law of universal gravity is $F = -G \frac{Mm}{r^{2.1}}$ instead of $F = -G \frac{Mm}{r^2}$. Find the speed of the satellite when it is at a distance $b$ from the star.

Similar Questions

Which of the following symptoms is likely to afflict an astronaut in space? $(a)$ Swollen feet,$(b)$ Swollen face,$(c)$ Headache,$(d)$ Orientational problem.

If the distance of Mercury from the Sun is $0.4$ times the distance of the Earth from the Sun,find the solar constant of Mercury in $cal/min \cdot cm^2$. The solar constant of the Earth is $2 \, cal/min \cdot cm^2$.

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