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Class 9 Physics Notes Chapter 5 Gravitation Exercise G = gravitational constant = 6673×1011 Nm 2 kg2 Formula shows that orbital speed of a satellite depends upon g, R and h The orbital velocity of the satellite depends on its altitude above Earth The nearer the Earth, the faster the required orbital velocity"K" is called electrostatic constant, it depends on the medium The value of 'K' in a vacuum medium, K = 9 x 10 9 Nm 2 /C 2 The formula of K in a vacuum, K = 1/4πε o Where ε o is known as permittivity of free space or vacuum ε o = 54 x 1012 C 2 /Nm 2 The formula of 'K' other than vacuum, K = 1/4πεOct 02, 19 · Gravitational constant is numerically equal to the force of attraction between two masses of 1 kg that are separated by a distance of 1 m 2 G is a scalar quantity 3 The 'G' is a universal constant, ie, its value is the same (ie 67 × 10 11 Nm 2 kg 2) everywhere in the universe Question 4 Revision Notes For Science Chapter 10 Gravitation Class 9t...