20161209_092033.pdf - Physics 111 Exam 4 LAST...

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Unformatted text preview: Physics 111 12/9/16 Exam 4 LAST nameEEEEEEEEEEIIEED First name_~_*_ Sec: M9 53 M73 T83 T113 T23 T53 T73 W8 W1 W43 W7 Th43 Exam room Seat number (1 pt for legible name and correct section circled) Physics 111 Exam Instructions ~PLEASE WRITE YOUR NAME ON ALL PAGES OF THIS EXAM. °No books, notes, headphones, earbuds, electronic devices, caps with bills, or sunglasses; calculators OK. -Standards for academic integrity will be enforced as described in the syllabus. -Be prepared to present your UMBC ID. -For objective items (e.g., multiple choice, multiple answer, true/false, matching) no work required and no partial credit. -For free-response items (e.g., calculate, determine, find, explain) show clear evidence of your reasoning process. A correct response without supporting work will receive no credit. An incorrect response may receive partial credit on the basis of clear, complete, and correct supporting work. OGive numerical results to two significant figures with appropriate units. Complete the arithmetic for full credit. (1—3) Cylinder A contains Ne atoms (mass ~ 20 u), and cylinder B contains Ar atoms (mass ~ 40u). Cylinder B is twice the volume of cylinder A. Both cylinders are at the same temperature and pressure. (2 pts each) 1. Which contains the greater 2. Which has the greater average 3. Which are moving faster on number of atoms? kinetic energy? average? a. cylinder A a. the Ne atoms (:Dthe Ne atoms @cylinder B b. the Ar atoms b. the Ar atoms a) c. they both contain the same C: (Dthey both have the Same fl c. they both are moving the same 1:) number of atoms average kinetic energy speed on average (4-6) An ideal gas in a cylinder expands. The cylinder is well- P insulated so that no heat flows between the surroundings and the : I: '1, ”Mlsotberms gas. The absolute value of the work that the surroundings do on the :1 l 1‘; “J, 3%; 3" gas is 100 I. 4. If the initial state is 0 on the diagram at right, what’s the final state? (2 pts} 12355195678 5. (2 pts) The sign of the work that the surroundings do on the gas is a. ositive (Eiegative j; c. zero 6. Find the change in thermal energy of the gas. Give the correct sign. (2 pts) a.» mo :7 [3 Name (7-11) A 2.0—kg block attached to a spring on a slippery level x (cm) surface moves back and forth according to the position vs. time graph shown. 7. (2 pts) During the interval of time 1.0 s < t< 1.5 s the b ock is a. . oving to the right and speeding up b. moving to the right and slowing down fl C. moving to the left and speeding up d. moving to the left and slowing down 8. (2 pts) During the interval of time 0.5 s < t < 1.0 s the block’s a. kinetic energy is increasing and spring potential energy is increasing b. kinetic energy is increasing and spring potential energy is decreasing kinetic energy is decreasing and spring potential energy is increasing d. kinetic energy is decreasing and spring potential energy is decreasing 9. (2 pts) At time t = 1.0 s the net force on the block is “ato the right " to the left I c. zero 10. Determine the spring constant of the s ri g. Show your work and give correct units. (3 pts) W...” K flaw M/ j w 0) 'i/ L) X i ,2 aw a 3‘53 11. At t = 0.5 s the block is moving with a speed of 5.0 m/s. How far is the block from the equilibrium position at t = 1.0 s? Show your work. (3 pts) 8.- AN , '3 3% -i‘§..} '7‘,- lr‘ l au 37:» a». r E 3).. laL Name 12. In an attempt to make iced tea, you add 100 g ofice at 0°C to 200 ml (200 g) of tea at 80°C. What’s the final temperature? (For both tea and water, use a specific heat of 4.200 I/kg°l(. The heat of fusion of ice is 3.3x105 I/kg.) (7 pts) 'x.._ W Ms W} i “”3 figafiwmx WWW (‘69,;égikl’i} {(2.433 ’éfi L.» ”7133!» 7%»wa V3. lflég‘r a ,2 72 c; 1Wm Name 13. A cylinder contains 2.0 moles ofa monotomic ideal gas at 400 K. a. The gas is heated to 600 K at a constant volume. How much heat is transferred from the surroundings to the gas? Show your work (3 pts) W5 .3 [b-c) The gas is now returned to its original temperature. This time, it's heated to 600 K at a constant pressure. b. How much heat is transferred from the surroundings to the gas? Show your work. (3 pts) : ‘7‘ (33 j; «“333 N2) - ~W$fi9¥a¥“‘“’“* team, '.“'W c. How much work is done by the gas on the surroundings during this process? Show your work and get the sign right. 43 pts) ‘1' 3 l? A. $1 1“ X"... i U “ F.» , V..,‘ .M., d. In which case is the increase in thermal energy greater? (3 pts) i. heating to 600 K at constant volume ii. heating to 600 K at constant volume iii. he increase in thermal energy is the same in both cases ’7 ...
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