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WMU PHYS 1070 - Exam

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XF.14A 107PHYS-107(14) (Kaldon-14959) Name_________________________________________________WMU - Summer I 2003Final Exam - 200,000 points CHECK-OUT: T1 T2 Q21 Q23 _________Rev. 06/23/02 M.7State Any Assumptions You Need To Make – Show All Work – Circle Any Final AnswersUse Your Time Wisely – Work on What You Can – Be Sure to Write Down EquationsShort Answers Should Be Short! – Feel Free to Ask Any Questions “Last Chance” (50,000 points) Multiple-Guess-Pick-The-Best-Answer-Fill-In-The-Bubbles1.) In parts (a)-(d), select which Newton’s Law or Conservation Law best applies.(a) You hit me, but I hit you just as hard…A = Newton’s 1stB = Newton’s 2ndC = Newton’s 3rdD = Momentum E = Energy F = None of these(b) The First Law of Thermodynamics is a statement about…A = Newton’s 1stB = Newton’s 2ndC = Newton’s 3rdD = Momentum E = Energy F = None of these(c) This is the only one that does not involve vectors.A = Newton’s 1stB = Newton’s 2ndC = Newton’s 3rdD = Momentum E = Energy F = None of these(d) An object at rest tends to stay at rest…A = Newton’s 1stB = Newton’s 2ndC = Newton’s 3rdD = Momentum E = Energy F = None of theseIn parts (e)-(h), select which speed best represents the situation described.(e) “So, there we were, just walking to class.”A = 2.0 m/s B = 8.0 m/s C = 30. m/s D = 270 m/s E = 610 m/sF = 22,000 m/s(b) “So after this stupid physics class, I’m flying down to Disney World!”A = 2.0 m/s B = 8.0 m/s C = 30. m/s D = 270 m/s E = 610 m/sF = 22,000 m/s(c) “So, man, we were like, just listening to some tunes and zoomin’ to Detroit on I-94.”A = 2.0 m/s B = 8.0 m/s C = 30. m/s D = 270 m/s E = 610 m/sF = 22,000 m/s(d) “He catches the football! He’s running down the field! He’s at the 30… the 20… the 10… Touchdown!”A = 2.0 m/s B = 8.0 m/s C = 30. m/s D = 270 m/s E = 610 m/sF = 22,000 m/sIn parts (i)-(j), select the answer that best fills in the blank.(i) A tuning fork chimes f = 480 Hz. A second fork, with a lower pitch, has a frequency _____ the first fork.A = more than B = less than C = the same asD = None of these(j) An electron in hydrogen is moved to a larger diameter orbit. The strength of the Coulomb electric forcebetween the electron and the proton is now _______ it was. Ignore the minus sign due to attraction.A = more than B = less than C = the same asD = None of these! " # $ % &! " # $ % &! " # $ % &! " # $ % &! " # $ % &! " # $ % &! " # $ % &! " # $ % &! " # $ % &! " # $ % &Physics 107 / Exam 3 [Form-A] Summer I 2003 Page 2Happy Holidays! (50,000 points)2.) For Thanksgiving, we cooked a 17.74 pound ( m = 8.06 kg ) turkey.When it went into the oven it was still cold, 40°F (4.44°C). To beproperly cooked, one source suggests that the interior should be heated to170°F (76.7°C). (a) Assuming that the turkey is mostly water, andtherefore has a specific heat of cwater = 4180 J/kg·°C, how much energydid it take to heat the turkey?(b) The bird was in the oven for 4.00 hours. Find the power in Watts that was used to heat the bird. If youdidn’t get an answer to (a), use Q = 1,000,000 J.(c) If the oven runs at 1250 W, what is the efficiency of cooking the turkey? In other words, what percentage ofthe total power actually went into cooking the turkey? If you didn’t get an answer to (b), use P = 511 W.If this was an electric oven, plugged into a 220 volt outlet, find (d) thecurrent I and…(e) … the resistance R of the oven? Note: This does not depend on (d).Freedom From Want – Norman Rockwell .Physics 107 / Exam 3 [Form-A] Summer I 2003 Page 3And Now From the Land of Hockey And SARS, eh? (50,000 points)3.) Mrs. Dr. Phil just got back last night from a conference in Toronto, Ontario, Canada. Earlier inthe day she visited the Sky Pod – the “World’s Highest Observation Deck at the CN Tower, Canada’s Wonderof the World” – which is 1465 feet (447 m) above the ground. (a) If the express elevator has a total mass of5550 kg, find the change in the Potential Energy, DP.E., as the elevator goes from ground to Sky Pod.(b) If water to the bathroom on the Sky Pod level is pumped up from the ground, what gauge pressurein the column of water is necessary to get the water 1465 feet (447 m) above the ground?(c) Calculate the speed that any object – water, the elevator, a tourist’s camera – will free fall to theground from the Sky Pod level. Assume no air resistance, as usual.(d) One of Toronto Blue Jay baseball players is invited up to the Sky Pod level and throws a MajorLeague fastball straight out – with v0x = 45.0 m/s (101 mph). How far does it travel horizontally beforeit first hits the ground? Again, ignore air resistance.(e) A week from today, July 1st, is Canada Day – the Canadians’ equivalent of the American 4th of July. Duringthe festive celebrations, fireworks are shot off in the CN Railways yard that surrounds the CN Tower. One ofthe shells is shot straight up and comes to a stop (and exploding into a lovely red and yellow starburst) at thesame height as the Sky Pod. Find the vector velocity of the shell at time t = 0.kPhysics 107 / Exam 3 [Form-A] Summer I 2003 Page 4Ah, Summertime in Michigan – And the Roads Are All Set to be Torn Up! (50,000 points)4.) June Bugs bring summer heat… and Michigan highway construction projects. Michigandrivers, of course, hate to slow down for anything. How long (time) does it take for a cardriving at 70 mph (31.3 m/s) to travel four miles (6440 m)?(b) Assuming that traffic does not come to a stop, find the time it takes to travel thefour miles (6440 m) at the reduced speed of 50 mph (22.4 m/s), and the number ofseconds longer it takes than at 70 mph.(c) Car A (m = 2135 kg) is heading north and has properly slowed to 50 mph (22.4 m/s). Car B(m = 2324 kg) is still traveling northward at 70 mph (31.3 m/s) and failing to slow down for theconstruction zone, rear ends Car A. With what speed will the car wreck (Car A+B) be travelingright after impact?(d) Car C (m = 2547 kg) is also heading north at 70 mph (31.3 m/s) and sees the collision 103 m infront. Find the acceleration, ax, that Car C needs in order to come to a stop in 103 meters.(e) Assuming that Car C has anti-lock brakes and maintains control the entire time it is braking, find thecoefficient of friction that just manages to brings the car to a stop. …


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