Exam 2--PHYS 151--S16
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1 Name: Exam 2--PHYS 5--S6 Multiple Choice Identify the choice that best completes the statement or answers the question.. Which of these are characteristics of ideal fluid flow? I. steady II. laminar III. rotational IV. turbulent a. I & II b. II & III c. II & IV d. I only 2. Liquids are ; gases are. a. compressible; incompressible b. incompressible; incompressible c. incompressible; compressible d. compressible; compressible 3. Which of these is a unit for flow rate? a. m 2 /s b. m/s c. m 3 /s d. m 2 /s 3 e. m/s 3 4. Which of these principles says that the flow rate must be constant in a closed system? a. Conservation of Energy b. Pascal s Principle c. Bernoulli s Principle d. Boyle s Law e. Equation of Continuity 5. Consider this pipe. Which of these best describes the velocity of the fluid, v 2? a. v 2 >v b. v 2 <v c. v 2 =v d. v 2 =0 m/s 6. The Poiseuille equation, given below, describes the flow rate of an ideal fluid in a cylindrical pipe. A fluid flows through a pipe at a rate Q. If the viscocity of the fluid is increased by a factor of 2, what is the new flow rate? Q= πr4 P 8ηL a. 2 Q b. 2Q c. d. 4 Q 6 Q e. 4Q 7. Which of these has the lowest viscocity? a. air b. jello c. maple syrup d. liquid water 8. According to the Poiseuille equation, a viscous fluid needs to maintain flow. a. a lengthening of the path b. a constriction of the pipe c. an increase in height d. a continuous drop in pressure
2 9. Water flows through a -cm diameter pipe connected to a /2-cm diameter pipe. Compared to the speed of the water in the -cm pipe, the speed in the /2-cm pipe is: a. one-quarter b. one-half c. the same d. double e. four times 0. Consider this simple diagram of the heart. Which part is the left atrium? a. a b. b c. c d. d. Consider the simple diagram of the heart in the previous question. In which section does blood arrive with its lowest pressure? a. a b. b c. c d. d 2. Consider the simple diagram of the heart. Where is the blood just before going into the pulmonary circuit? a. a b. b c. c d. d 3. The pressure occurs when the heart contracts? a. systolic b. diastolic c. laminar d. hypertension 4. Consider this coronary artery, which is partially blocked. What happens to the speed of the blood flowing through the blocked section? a. it increases b. it decreases c. it stays the same 5. A person s blood pressure is generally measured on the arm, at approximately the same level as the heart. How would the results differ if the measurement were made on the person s leg instead? a. blood pressure would be lower b. blood pressure would not change c. blood pressure would be higher 6. An iron lung helps a person to breathe. When the person wants to inhale, how does the pressure inside the iron lung compare to the pressure outside of it? a. the pressure inside is higher b. the pressure inside is lower c. the pressure inside is the same as outside d. it depends on the person s breathing rate 7. Intraocular pressure is the pressure of fluids in the. a. bladder b. eye c. brain d. lungs 8. If you weight 80 pounds and stand on one leg, what is the stress on your knee joint, whose area is 0.5 square inches? a. 80 psi b. 360 psi c. 900 psi d. 90 psi 2
3 9. Work happens when a force causes. a. disarray. b. defamation c. deformation d. displacement 20. Consider this roller coaster. At which location does the cart have the most potential energy? 24. An object is traveling a speed v and has a kinetic energy K. If it speeds up to 2v, what is the object s kinetic energy a. 4 K b. 2 K c. K d. 2K e. 4K 25. Consider this diagram of a guy pushing a car to the right. What type of work is the frictional force (F friction ) doing on the car? a. A b. B c. C d. D e. the cart has the same potential energy at all locations 2. Consider the roller coaster in the previous problem. At which location does the cart have the highest speed? a. A b. B c. C d. D e. the cart has the same speed at all locations 22. If I do negative work on an object, the energy will. a. vary between positive and negative values b. remain the same c. decrease d. increase 23. Which of these are units of work? a. N/m b. Nm c. Nm/s d. m/n a. positive work b. negative work c. zero work d. it depends on the weight of the car 26. I move an object of mass m to a height h. What work have I done on this object? a. m/(gh) b. F/h c. mgh d. mg/h 27. A mechanical system is 40% efficient. If I put in 00 Joules of energy, how much work will the system do? a. 40 J b. 00 J c. 40 J d. 60 J 28. Potential energy is the energy of. a. position b. acceleration c. velocity d. motion 3
4 29. Energy from food comes in the form of carbohydrates, proteins, and. a. calories b. grains c. muscles d. meat e. lipids 30. Which is larger, TMR or BMR? a. TMR b. BMR c. both are the same d. it depends on the person s metabolism 3. Lipids contain about the energy density of carbohydrates. a. ten times b. one-tenth c. twice d. one-half 32. Donuts have a high density and a low density. a. sugar; carbohydrate b. nutrient; energy c. energy; nutrient d. lipid; sugar 33. A food calorie ( Cal) is equivalent to how many calories (cal)? a. Cal = 000 cal b. Cal = 0.00 cal c. Cal = cal d. Cal = 00 cal 34. The work done to move an object might be 00 cal. However, a person s body might require 500 cal to complete the action. Why is there a discrepancy between the completed work and the required energy? a. kinetic energy requires more work than potential energy b. muscles are very inefficient c. work is always less than energy d. the conversion of chemical energy requires more work 35. The typical BMR of a person is 65 cal/hour. Then, what is the minimum calorie intake a person needs to function for 24 hours? a. 00 cal b. 000 cal c. 600 cal d cal 36. Which of these is a good source of lipids? a. bananas b. lean meat c. bread d. olive oil 37. Which of these is a way the body responds when it is cold and needs to be warmer: I. Sweating II. Shivering III. Contraction of blood vessels in the skin IV. Increase BMR a. II & III b. I only c. II, III, & IV d. I, II, & III e. II & IV 38. Most of the body s heat is lost by which of these mechanisms? a. convection b. radiation c. sweating d. conduction 39. Latent heat of fusion is the energy required to. a. raise the temperature of an object b. change a solid to liquid c. change a liquid to gas d. sublimate matter 4
5 40. The following describes thermal conduction. The thermal conduction through a material is 2 kcal/s. If the area of that material is doubled, what is the new rate of thermal conduction? Q = k A T d t a. kcal/s b. 2 kcal/s c. 4 kcal/s d. 8 kcal/s e. 6 kcal/s 4. The kelvin temperature scale is based on the triple point of water (0.0ºC) and. a. absolute zero b. melting temperature of silicone c. freezing point of water d. boiling point of water 42. What is absolute zero in degrees celsius? a. -273ºC b. 0ºC c. 32ºC d. -320ºC 45. Consider this equation which describes the rate of themal energy flow between two objects. Which of these materials will have a higher value for k? Q = k A T d t a. air b. water c. copper d. wood e. it depends on the size of the object 46. Which of these modes of thermal energy transfer requires contact between two bodies? I. Conduction II. Convection III. Radiation a. I & II b. II & III c. II only d. I only 43. For which of these temperature scales is a change in degree the smallest change in temperature? a. fahrenheit b. kelvin c. celsius d. degree for each is the same e. both kelvin and celsius are the smallest 44. Two object have the same mass and initial temperature, but object A has a higher specific heat than object B. Which object will require more energy to raise the temperature by 20 C? a. object A b. object B c. both will require the same amount of energy 5
6 ID: A Exam 2--PHYS 5--S6 Answer Section MULTIPLE CHOICE. ANS: A PTS: REF: S6 2. ANS: C PTS: REF: S6 3. ANS: C PTS: REF: S6 4. ANS: E PTS: REF: S6 5. ANS: A PTS: REF: S6 6. ANS: A PTS: REF: S6 7. ANS: A PTS: REF: S6 8. ANS: D PTS: REF: S6 9. ANS: E PTS: REF: S6 0. ANS: B PTS: REF: S6. ANS: A PTS: REF: S6 2. ANS: C PTS: REF: S6 3. ANS: A PTS: REF: S6 4. ANS: A PTS: REF: S6 5. ANS: C PTS: REF: S6 6. ANS: B PTS: REF: S6 7. ANS: B PTS: REF: S6 8. ANS: B PTS: REF: S6 9. ANS: D PTS: REF: S6 20. ANS: A PTS: REF: S6 2. ANS: B PTS: REF: S6 22. ANS: C PTS: REF: S6 23. ANS: B PTS: REF: S6 24. ANS: E PTS: REF: S6 25. ANS: B PTS: REF: S6 26. ANS: C PTS: REF: S6 27. ANS: C PTS: REF: S6 28. ANS: A PTS: REF: S6 29. ANS: E PTS: REF: S6-RQ 30. ANS: A PTS: REF: S6-RQ 3. ANS: C PTS: REF: S6 32. ANS: C PTS: REF: S6 33. ANS: A PTS: REF: S6 34. ANS: B PTS: REF: S6 35. ANS: C PTS: REF: S6 36. ANS: D PTS: REF: S6 37. ANS: C PTS: REF: S5,S6 38. ANS: B PTS: REF: S5, S6 39. ANS: B PTS: REF: S6
7 ID: A 40. ANS: C PTS: REF: S6 4. ANS: A PTS: REF: S6 42. ANS: A PTS: REF: S6 43. ANS: A PTS: REF: S5, S6 44. ANS: A PTS: REF: S5, S6 45. ANS: C PTS: REF: S6 46. ANS: D PTS: REF: S6 2
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