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7. gravitation — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics7. gravitation1 Mark
MCQ
A satellite revolves around the earth in an elliptical orbit. Its speed
  • A
    Is the same at all points in the orbit
  • ✓
    Is greatest when it is closest to the earth
  • C
    Is greatest when it is farthest from the earth
  • D
    Goes on increasing or decreasing continuously depending upon the mass of the satellite
✓

Answer

Correct option: B.
Is greatest when it is closest to the earth
b
(b) Speed of satellite is greatest when it is closest to earth as near earth surface $r$

$\approx \mathrm{R}, \mathrm{V}_{0}=\sqrt{(\mathrm{GM} / \mathrm{r})}=7.9 \mathrm{kms}^{-1}$

This is maximum speed of satellite

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