only those students who are in class 9 will answer this question please
give me 8 numericals related to gravitation chapter
please don't waste points
Answers
Answer:
Gravitation .Olympiad Practice
1. Calculate the gravitational force between a 10-kg ball and a 20-kg ball placed at a separation of 5 m.
2. Three balls A, B and C are kept in a straight line. The separation between A and C is 1 m, and B is placed at the midpoint between them. The masses of A, B, C are 100 g, 200 g and 300 g respectively. Find the net gravitational force on (a) A, (b) B, and (c) C.
3. A particle of mass m1 is kept at x = 0 and another of mass m2 at x = d. When a third particle is kept at x = d/4, it experiences no net gravitational force due to the two particles. Find m2/m1.
4. The acceleration due to gravity near the earth's surface is 9.8 m/s2, and the earth's radius is 6,400 km. From this data calculate the mass of the earth. Use any universal constant if required.
5. Two particles of mass 200 g each are placed at a separation of 10 cm. Assume that the only forces acting on them are due to their gravitational attraction. Find the acceleration of each when they are allowed to move.
6. A particle weighs 120 N on the surface of the earth. At what height above the earth's surface will its weight be 30 N? Radius of the earth = 6,400 km.
7. Suppose the earth shrinks such that its radius decreases to half the present value. What will be the acceleration due to gravity on the surface of the earth?
8. A body weighs 120 N on the earth. Find its approximate weight on the moon.
Explanation:
1. 5.34 x 10"10 N 2. (a) 7.34 x 10 12 N towards C
(b) 1.07 x 10 12 N towards C (c) 1.80 x 10 12 N towards A
3. 9 4. 6.02x1024 kg 5. 1.33 x 10 ~9 m/s2
6. 6,400 km 7. 39.2 m/s2 8. 20 N