MHT CET 2021 20th September Morning Shift | Gravitation Question 52 | Physics

The orbital velocity of an artificial satellite in a circular orbit just above the earth's surface is 'V'. For the satellite orbiting at an altitude of half the earth's radius, the orbital velocity is

$$\frac{3}{2}$$V

$$\sqrt{\frac{3}{2}}$$V

$$\sqrt{\frac{2}{3}}$$V

$$\frac{2}{3}$$V

MHT CET 2020 19th October Evening Shift

MCQ (Single Correct Answer)

-0

Earth has mass $M_1$ and radius $R_1$. Moon has mass $M_2$ and radius $R_2$. Distance between their centre is $r$. A body of mass $M$ is placed on the line joining them at a distance $\frac{r}{3}$ from centre of the earth. To project the mass $M$ to escape to infinity, the minimum speed required is

$\left[\frac{3 G}{r}\left(M_1+\frac{M_2}{2}\right)\right]^{\frac{1}{2}}$

$\left[\frac{6 G}{r}\left(M_1+\frac{M_2}{2}\right)\right]^{\frac{1}{2}}$

$\left[\frac{6 G}{r}\left(M_1-\frac{M_2}{2}\right)\right]^{\frac{1}{2}}$

$\left[\frac{3 G}{r}\left(M_1-\frac{M_2}{2}\right)\right]^{\frac{1}{2}}$

MHT CET 2020 19th October Evening Shift

MCQ (Single Correct Answer)

-0

The escape velocity of a body from any planet, whose mass is six times the mass of earth and radius is twice the radius of earth will (v$_e$ = escape velocity of a body from the earth's surface)

$2 \sqrt{2} v_e$

$\frac{3}{2} v_e$

$2 v_e$

$\sqrt{3} v_e$

MHT CET 2020 16th October Evening Shift

MCQ (Single Correct Answer)

-0

The ratio of energy required to raise a satellite of mass $$m$$ to a height $$h$$ above the earth's surface of that required to put it into the orbit at same height is [$$R=$$ radius of the earth]

$$\frac{h}{R}$$

$$\frac{3 h}{R}$$

$$\frac{4 h}{R}$$

$$\frac{2 h}{R}$$

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