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Unformatted text preview: 5. Two particles have a mass of 8 kg and 12 kg, respectively. If they are 800 mm apart, determine the force of gravity acting between them. Compare this result with the weight of each particle. 6. Identify the various branches of mechanics? 7. What are the differences between statics and dynamics? 8. Balloons are often fills with helium gas because it weighs only about one-seventh of what air weighs under identical conditions. The buoyancy force which can be expressed as F b = air gV air , will push the balloon upward. If the balloon has a diameter of 10 m and carries two people, 70 kg each, determine the acceleration of the balloon when it is first released. Assume the density of air = 1.16 kg/m 3 , and neglecting the weight of ropes and the cage. _________________________________________________________________________...
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- Spring '08