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physics 02 gravitation
Pg.No.
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Page 1
Q.1. By which force every body attracts other body?
Q.2. What is formula for gravitation?
Q.3. Which force of earth pulls a body towards its centre?
Q.4. Name the law which states that "The force of gravitational attraction between two point bodies is directly proportional to the product of their masses and inversely proportional to the square of distance between them?
Q.5. What is gravitational acceleration (g) on earth?
Q.6. What will be the value of gravity on increasing height or depth from earth's surface?
Q.7. Where the gravity is maximum on the earth?
Q.8. Where the gravity is minimum on the earth?
Q.9. How the gravity is affected by the rotation of the earth?
Q.10. How the gravity is affected by the increase in angular speed of the earth?
Q.11. How much is the acceleration due to gravity at the Moon to that of the Earth ?
Q.12. How will a body feel on the equator, if the angular speed of the earth becomes 17 times of its present value?
Q.13. How acceleration due to the gravity is related to the shape, size and mass of the body?
Q.14. What will be the apparent weight of the body to its real weight, if lift is stationary or moving upward or downward with uniform speed?
Q.15. What will be the apparent weight of the body to its real weight, if lift is going up with acceleration?
Q.16. What will be the apparent weight of the body to its real weight, if lift is going down with acceleration?
Q.17. What happens to the person in the lift going down, if the acceleration of the lift is more than acceleration due to gravity?
Q.18. What will the weight of a body in a lift, if the lift falls freely due to its cord breaking?
Q.19. Name the law which states that "All planets move around the sun in elliptical orbits, with the sun being at the rest at one focus of the orbit"?
Q.20. Which law states that "The square of the period of revolution of a planet around the sun is directly proportional to the cube of the mean distance of that planet around the sun"?
Q.21. Which law states that "The areal velocity of planet around the sun always remain constant"?
Q.22. When the speed of the planet is maximum around the sun?
Q.23. When the speed of the planet is minimum around the sun?
Q.24. Which planet takes 88 days to complete one revolution around the sun?
Q.25. Name the natural or artificial bodies revolving around a planet under its gravitational attraction?
Q.26. Which is the natural satellite of the earth?
Q.27. Which is the first artificial satellite of the earth?
Q.28. What is the orbital speed of a satellite revolving near the surface of earth?
Q.29. How much time a satellite takes to complete one revolution near the surface of earth?
Q.30. Name the satellite which revolves 24 hours in equatorial plane in the direction of earth's rotation?
Q.31. At what height geo-stationary satellite revolves around the earth in it's parking orbit?
Q.32. Which satellite is used to telecast TV programmes from one part of the world to the another, in weather forecasting, in predictions of droughts and floods?
Q.33. Who had first predicted that a communication satellite can be stationed in the geosynchronous orbit?
Q.34. In which direction Earth rotates on its axis which makes the Sun appears to be moving across the sky from East to West?
Q.35. Which satellite revolves around the Earth in polar orbit at a height of 800km approx.?
Q.36. What is the time period of polar satellites?
Q.37. The minimum velocity with which a body should be projected from the earth surface so it goes out of the gravitational field of the earth and never return back to earth is known as?
Q.38. Escape velocity is also known as?
Q.39. How escape velocity is related to the mass, shape and size of the body and its direction of projection?
Q.40. How much is the escape velocity for earth?
Q.41. How much is the escape velocity for moon?
Q.42. How much the orbital velocity of a satellite should be increased, so that the satellite leave the orbit and escape?
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