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Physics 3210

Physics 3210. Week 6 clicker questions. A. B. C. D. In central-force motion, the areal velocity is a constant What is the period t of an elliptical orbit with area A?. Area=A. A. Otherwise the planets wouldn’t all be in the same orbital plane.

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Physics 3210

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  1. Physics 3210 Week 6 clicker questions

  2. A. B. C. D. In central-force motion, the areal velocity is a constant What is the period t of an elliptical orbit with area A? Area=A

  3. A. Otherwise the planets wouldn’t all be in the same orbital plane. B. In two-body central-force motion one mass is always at the focus on the orbit. C. In two-body central-force motion the center of mass is always at the focus of the orbit, and the center of mass position is approximately given by the position of the sun. D. The moon is at the other focus. Kepler’s First Law states that planets move in elliptical orbits with the sun at one focus. Why is the sun at one focus of the orbit? Because... Sun

  4. A. B. C. D. E. A system of n particles is described by the masses and positions of each particle: What is the position of the center of mass R of the system?

  5. A. B. C. D. E. Consider particles a and b, and the internal force fab=the force on particle a due to particle b. How does Newton’s third law relate the internal forces? fab a b

  6. A. Nothing – having no external forces doesn’t determine the momentum of the system. B. The momentum of each particle is constant. C. The momentum of some (but not all) of the particles is constant. D. The momentum of the center of mass of the system is constant. Suppose a system of particles experiences only internal forces (no external forces). What can you say about the momentum of the system?

  7. Physics 3210 Wednesday clicker questions

  8. A. B. C. D. E. A chain with length b and mass density r is initially attached at both ends. One end of the chain is cut. After this falling end has moved down a distance x, what is the mass of the right (falling) side of the chain? x

  9. A. B. C. D. A chain with length b and mass density r is initially attached at both ends. One end of the chain is cut; the other end of the chain experiences a tension T. As the chain falls, what is the total external force on the chain (in the x direction)? x

  10. A. B. C. D. E. A chain with length b and mass density r is initially attached at both ends. The height is measured by x (increasing down) and the potential energy is zero at the attachment point. What is the total potential energy of the chain? x

  11. A. B. C. D. A system of n particles is described by the masses and positions of each particle, relative to the center of mass: What can you say about the quantity ?

  12. Physics 3210 Friday clicker questions

  13. A. Nothing. B. C. D. Consider particles a and b; the internal force fab=the force on particle a due to particle b; the position vector rab= the vector from particle a to particle b. If the force between the two particles is central, what can you say about rabfab? rab a b

  14. A. B. C. D. A system of n particles is described by the masses and positions of each particle, relative to the center of mass: The squared velocity of each particle is thereforeWhat is the total kinetic energy of the system?

  15. A. B. C. D. The work done in unwrapping a rope from a cylinder is given byWhat is the total work done?

  16. A. B. C. D. What is the total kinetic energy of the rope-cylinder system?

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