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Chapter 5: Q20. (page 131)
People sometimes ask, "What keeps a satellite up in its orbit around the Earth?" How would you respond?
The satellite remains in the orbit due to its speed and centripetal force.
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A certain neutron star has five times the mass of our Sun packed into a sphere about 10 km in radius. Estimate the surface gravity on this monster.
A child on a sled comes flying over the crest of a small hill as shown in Fig. 5-32. His sled does not leave the ground, but he feels the normal force between his chest and the sled decrease as he goes over the hill. Explain this decrease using Newton's second law.
Highway curves are marked with a suggested speed. If this speed is based on what would be safe in wet weather, estimate the radius of curvature for an unbanked curve marked 50 km/h. Use Table 4-2 (coefficients of friction).
At the surface of a certain planet, the gravitational acceleration g has a magnitude of . A 24.0-kg brass ball is transported to this planet. What is (a) the mass of the brass ball on the Earth and on the planet, and (b) the weight of the brass ball on the Earth and the planet?
A coin is placed 13.0 cm from the axis of a rotating turntable of variable speed. When the speed of the turn-table is slowly increased, the coin remains fixed on the turntable until a rate of 38.0 rpm (revolutions per minute) is reached, at which point the coin slides off. What is the coefficient of static friction between the coin and the turntable?
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