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Unformatted text preview: 3 . Example 2: Determine the force of gravitational attraction between the Earth and a 70-kg object if a) the object is on the Earth’s surface b) the object is 10 km above earth' s surface Example 3: A satellite in orbit around the earth has a period of one hour. An identical satellite is placed in an orbit having a radius which is nine times larger than the first satellite. What is the period of the second satellite? Example 4 Three particles with masses m 1 = 3.0 kg, m 2 =2.0 kg and m 3 =4.0 kg are placed at the corners of an equilateral triangle of side 1.5 m, as shown in Figure 5.Find the total gravitational energy of the system. Example 5: A rocket is fired vertically upward from the north pole with a velocity 5 kms-1 . How far far above the Earth’s surface will it rise? 1 m = 4.0 kg m = 1.0 kg m = 9.0 kg 2 3 0.3 m 0.5 m Figure 2 m m m 1 2 3 1.5 m Figure 5 PPH0075 Gravitation Reinforcement Question __________________________________________________________________________________ ASD2007/08 2/ 2 Answer : 1. Σ F = -0.56 x 10-9 N 2. (a) F = 685.94 N (b) F = = 683.80 N 3. T 2 = 27 h 4. U total = - 1.16x10-9 J 5. h =1.60 x 10 6 m...
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- Spring '09
- General Relativity, Reinforcement Questions Chapter