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Homework-18 1. Fill the table Fg .5 N 100 N m1 5000 kg 3.2 x 1026 5.2 x 1013 106 kg m2 10,000 kg 1000 kg 5.9 x 1024 kg r 100 m 100,000 m 5,000,000 m 2. Two bowling balls each have a mass of 6.8 kg. They are located next to one another with their centers 21.8 cm apart. What gravitational force do they exert on each other? 3. Two spherical balls are placed so their centers are 2.6 meters apart. The Fg between them is 2.75 x 10-12 N. What is the mass of each ball if one is twice the mass of the other ball? 2.6 m m 2m 4. What is the force of gravity between a 60 kg women and an 80 kg man standing a) 5.0 m apart b) .3 m apart 5. Calculate the force of gravity on a spacecraft 12,800 km above the Earth’s surface if its mass is 1400 kg. (radius of the earth = 6.38 x 106m, mass of the earth = 5.97 x 1024 kg) 6. A person has weight of 1000 N, what would their weight be if a) earth’s radius is ½ & mass is doubled b) earth’s radius is ¼ & mass is tripled c) earth’s radius is doubled & mass is ½ d) earth’s radius is tripled & mass is ¼