Physics - Gravitation Questions and Answer >> 26. The value of ‘g’ at a particular point is 9.8 m/s2 . Suppose the earth suddenly shrinks uniformly to half its present size without losing any mass. The value of ‘g’ at the same point (assuming that the distance of the point from the centre of earth does not shrink) will now be . 4.9 m/s2 9.8 m/s2 3.1 m/s2 19.6 m/s2 Answer & Explanation Answer: 9.8 m/s2 Explanation: g = (GM/r2). Since M and r are constant, so g=9.8 View Answer Report Error Let us discuss 27. Assuming earth to be a sphere of a uniform density, what is the value of gravitational acceleration in a mine 100 km below the earth’s surface (Given R = 6400 km) . 9.66 m/s2 5.06 m/s2 7.64 m/s2 3.10 m/s2 Answer & Explanation Answer: 9.66 m/s2 Explanation: g = g(1-(d/r)) = 9.8(1-(100/6400)) = 9.66 View Answer Report Error Let us discuss 28. The radius of the earth is 6400 km and g= 10 In order that a body of 5 kg weighs zero at the equator, the angular speed of the earth is. 1/80 radian/sec 1/800 radian/sec 1/400 radian/sec 1/1600 radian/sec Answer & Explanation Answer: 1/800 radian/sec Explanation: ω = √(g/R) = √(1/640*1000) = 1/8000 View Answer Report Error Let us discuss 29. The weight of a body at the centre of the earth is . Zero Same as on the surface of earth Infinite None of the above Answer & Explanation Answer: Zero Explanation: Help us to explain question in discussion View Answer Report Error Let us discuss 30. The gravitational force between two point masses m1 and m2 at separation r is given by F = km1m2/r2 The constant k. Depends on system of units only Depends on both (a) and (b) Depends on medium between masses only Is independent of both (a) and (b) Answer & Explanation Answer: Depends on system of units only Explanation: k represents gravitational constant which depends only on the system of units
Posted on: Mon, 04 Aug 2014 16:17:25 +0000
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