10 multiple choice question.
1. Poiseuille's equation says that the volume of fluid that flows through a tube past a given point, during some unit of time, depends on what physical quantities?
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| the force per unit length and the length of the tube |
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| the pressure difference across the length of the tube, the radius of the tube, and the viscosity of the liquid |
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| the cross sectional area of the tube, the viscosity of the liquid, the velocity of the liquid, and the length of the tube |
2. Surface tension on the surface of water, which can support an insect standing on water, is caused by which kind of forces?
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| cohesive forces |
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| adhesive forces |
3. Which of the following best describes mechanical energy?
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| It is the kinetic and potential energy of the center of mass |
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| It is the kinetic and potential energy of the individual particles comprising an object |
4. Mechanical energy is calculated using the motion and position of
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| the center of mass |
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| the individual particles comprising an object |
5. What is the difference between the speed that particles have due to thermal energy and the speed that is used to calculate the kinetic energy of an object's center of mass?
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| the thermal energy speed describes the speed of particles between collisions with other particles, while the kinetic energy speed describes the overall speed of the object |
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| the kinetic energy speed describes the speed of particles between collisions with other particles, while the thermal energy speed describes the overall speed of the object |
6. In which state do the particles of a material generally have the highest speeds?
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| solid |
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| liquid |
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| gas |
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| speeds are equal at a given temperature, regardless of phase |
7. Heat is
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| energy transferred between objects |
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| internal energy that is related to the temperature of the object |
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| both (a) and (b) are true |
8. You have a block of ice to which you add 13 kcal of heat. The temperature does not change. What likely happened to that energy?
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| It was transferred into raising the kinetic energy of the molecules, not changing the state (melting) the ice. |
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| It was transferred into changing the state (melting) the ice. |
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| No answer text provided. |
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| No answer text provided. |
9. The work done by the environment (external forces) on an object is _______ when the object gains energy. (Assume no heat exchange.)
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| positive |
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| negative |
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| zero |
10. True or false: we can calculate the work done on an object by knowing the pressure on the object and the object’s change in volume.
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| True |
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| False |
