Tiêu đề 6. GRAVITATION WS-4 (119-125).pmd.pdf ✅

Olympiad Class Work Book VIII – Physics (Vol – III) 4) Orbital velocity of a satellite revolving in a circular path close to the planet. 1) is directly proportional to density of the planet 2) is directly proportional to the square root of density of the planet 3) is directly proportional to the square of density of planet 4) is inversely proportional to the square root of density of planet. 5) For a planet revolving round the sun, when it is nearest to the sun 1) K.E is min and P.E is max 2) both K.E and P.E are min 3) K.E is max and P.E is min 4) K.E and P.E are equal 6. The time period of an earth’s satellite in circular orbit is independent of 1) The mass of the satellite 2) Radius of its orbit 3) Both the mass and radius of the orbit 4) Neither mass of satellite nor radius of its orbit Single Answer Choice Type: 1. The mean orbitals radius of earth around the sun is 8 1.5 10  km . Then mass of the sun is   11 2 2 6.67 10  G Nm kg   1) 27 4 10  kg 2) 27 2 10  kg 3) 30 1 10  kg 4) 30 2.0 10  kg 2. Calculate the escape velocity from the surface of moon. The mass of the moon is 22 7.4 10  kg and radius 6   1.74 10 m 1) 24 km/s 2) 2.4 km/s 3) 100 m/s 4) 24 m/s 3. The escape velocity of a body depends upon mass as 1) 0 m 2) 1 m 3) 2 m 4) 3 m 4. The angular velocity of rotation of a star of mass M and radius R at which. The matter will start escaping from its equator is 1) 2GR M 2) 3 2GM R 3) 2GM R 4) 2 2GM R 5. The ratio of escape velocity at earthVe  to the escape velocity ata planet Vy  whose radius and density are twice as that of earth is 1) 1: 2 2) 1: 2 3) 1: 2 2 4) 1: 4