November 14, 2017 Exam 3-A Phys 1410 system = Earth + box ground E arth Figure 2

Question

November 14, 2017 Exam 3-A Phys 1410 system = Earth + box ground E arth Figure 2: The system in question is the Earth and the box, not the Earth, box, and human. 9. A person pulls a box along the ground at a constant speed. If we consider Earth and the box as our system, what can we say about the net external force on the system? A. It is zero because the system is isolated. B. It is non-zero because the system is not isolated. C. It is zero even though the system is not isolated. D. It is nonzero even though the system is isolated. 10. A golf ball (mass 1.6 oz) is fired at a 10 lb bowling ball. The bowling ball is initially at rest and the golf ball bounces backelastically. Compared to the bowling ball, the golf ball hasthan the bowling ball. A. more momentum but less kinetic energy B. more momentum and more kinetic energy C. less momentum and less kinetic energy D. less momentum but more kinetic energy 11. A ball of putty (mass 1.6 oz) is fired at a 10 lb bowling bal. The bowling ball is initially at rest and the golf ball sticks to the bowling ball. Compared to the bowling ball, the golf ball hasthan the bowling ball. A. more momentum but less kinetic energy B. more momentum and more kinetic energy C. less momentum and less kinetic energy D. less momentum but more kinetic energy

Explanation / Answer

9) since box and earth are a part of total system to due to the motion of block there will not be any net force on the system. since its isolated also

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