| ⇦ | 
| ⇨ |
A particle of masses m is thrown upwards from the surface of the earth, with a velocity u. The mass and the radius of the earth are, respectively, M and R. G is gravitational constant and g is acceleration due to gravity on the surface of the earth. The minimum value of u so that the particle does not return back to earth, is
Options
(a) √( 2GM / R)
(b) √( 2GM / R)²
(c) √( 2G R²)
(d) √( 2GM / R)²
Correct Answer:
√( 2GM / R)
Explanation:
The velocity u should be equal to the escape velocity. That is, u = √(2gR)
But g = GM / R² ⇒ u = √(2 . GM / R² . R)
√( 2GM / R)
Related Questions: - If radius of earth’s orbit is made 1/4, the duration of a year will become
- A car sounding a horn of frequency 100 Hz passes an observer. The ratio
- When photons of energy hν fall on an aluminium plate (of work function E₀),
- An electron of mass m and a photon have same energy E. The ratio of de-Broglie
- A spherical body of emissivity e=0.6, placed inside a perfectly black body is maintained
Topics: Gravitation
(63)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If radius of earth’s orbit is made 1/4, the duration of a year will become
- A car sounding a horn of frequency 100 Hz passes an observer. The ratio
- When photons of energy hν fall on an aluminium plate (of work function E₀),
- An electron of mass m and a photon have same energy E. The ratio of de-Broglie
- A spherical body of emissivity e=0.6, placed inside a perfectly black body is maintained
Topics: Gravitation (63)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply