Gravitation

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Question

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Question 1 : The radius of the earth is 6400 km and g = 10 m/s². In order that a body of 5 kg weighs zero at the equator, the angular speed of the earth is
1. 1/80 rad /s
2. 1/400 rad /s
3. 1/800 rad /s
4. 1/1600 rad /s
Answer
8282

Question 2 : A body weighs 500 N on the surface of the earth. How much would it weight half way below the surface of the earth?
1. 125 N
2. 250 N
3. 500 N
4. 1000 N
Answer
8283

Question 3 : The time – period of a satellite of earth is 5 hours. If the separation between the earth and the satellite is increased to 4 times the previous value, the new time – period will become
1. 10 hours
2. 20 hours
3. 40 hours
4. 80 hours
Answer
8284

Question 4 : A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is
1. Zero
2. Negative
3. Positive
4. may be positive or negative
Answer
8285

Question 5 : What would be the duration of the year if the distance between the earth and the sun gets doubled?
1. 1032 days
2. 365 days
3. 730 days
4. 129 days
Answer
8286