Which of the following are in equilibrium? Choose all that apply. (NOTE: "spinning up" means the rate of spin is increasing. "spinning down" means the rate of spin is decreasing.) 1. A disc that is slowing down and is spinning up. 2. A baseball that is slowing down and is not rotating. 3. A turntable that is slowing down and is spinning down. 4. A tire that is at rest and has a constant angular velocity. 5. A wheel that has a constant velocity and is spinning down. 6. A football that has a constant velocity and is not rotating. 7. A merry-go-round that is slowing down and has a constant angular velocity. 8. A planet that moves along a perfectly circular orbit at a constant speed.

Q: Which of the following are in equilibrium? Choose all that apply. [NOTE: "spinning up" means the…

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