3. A rock at rest has weight 138 N. What is the weight of the rock when it is accelerating upward at 12 m/s2?
4. An astronaut's pack weighs 17.5 N when she is on earth, but only 3.24 N when she is on the surface of an asteroid. What is the acceleration due to gravity on this asteroid?
5. A large sphere has a mass of 175 kg and is suspended by a chain from the ceiling. The mass of the chain is 12.0 kg. What is the tension in the chain?
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