PHY220 Midterm Exam NAME 1. multiple choice (10 points To determine an object in

Question

PHY220 Midterm Exam NAME 1. multiple choice (10 points To determine an object in equilibrium, the two criteria are A) energy conservation and momentum conservation B) net force -0 and energy conservation C) net force-0 and momentum conservation D) net torque 0 and energy conservation E) net torque 0 and momentum conservation 1. net force-0 and net torque 2. The correct Question 2 Please determine the forces direction on A (screw) and B (holder) when force F is applie pull the cork out of the top of a wine bottle A) force on A is up, force on B is down B) force on A is down, force on B is up C) both forces on A and B are up D) both forces on A and B are down 3. How the pressure of fluid is defined A) (force parallel to the surface)/area B) (force perpendicular to the surfaceyarea C) mass/volume D) weight/volume Two identical pails of water filled to the brim, then put a piece of wood on pail 2, and th is floating on water. Which pail has the greater weight? A) pail 1 is heavier B) pail 2 is heavier C) both pails have equal weight D) it depends on the shape of wood 4. Question 3 5· Question 5 6. Why huge metal ship can float on water but a small metal ball sinks into water? A) Because metal ships have engines to drive ship move B) because ships have density lower than that of water, but metal density is greater tha C) because ships have density greater than that of water but metal density is lower than 7. For a spring oscillates on a smooth horizontal surface with mass m and amplitude A, so A)the maximum speed of mass is at x=A B) the maximum speed of mass is x-0 C) the maximum speed of mass is at x-A D) because of energy conservation, the speed of mass is constant everywhere

Explanation / Answer

1) (F) Net force=0 and net torque=0

2) (B) Frsin(phi)

3) (B) force on A is down, force on B is up

4) (B) (force perpendicular to the surface)/area

5) question is half cut.

6) (B)

7) question is half cut.

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