X1.15a 107PHYS-107(15/16) (Kaldon-) Name __________S O L U T I O N_________WMU - Fall 2003Exam 1A - 100,000 points Book Title ________________________________________________Rev. 09/28/02 Su.A4State 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 QuestionsEXAM 1 [FORM - A]PHYS-107 (KALDON-15)FALL 2003WMUAnd now an important announcement:The Chicago Cubs Major League Baseball Team Has Wonthe National League Central DivisionCubs Win! Cubs Win! Cubs Win!Physics 107 / Exam 1 [Form-A] Fall 2003 Page 2Now Pay Attention – You Can Do This (50,000 points) Multiple-Guess-Fill-In-The-Bubbles1.)(a) Theresa needs to drive her car 40. miles in 30. minutes. What is her constant speed?The handy chart at left may be useful. 1800sec ÷ 40miles = 45 sec/mile, so 80 mphA = 50. mph B = 60. mph C = 70. mph D = 80. mphE = 90. mph F = None of these(b) Tabitha also drives her car 40. miles in 30. minutes, but going from rest to some final speed atconstant acceleration. What is her average speed? Same as in (1a).A = 50. mph B = 60. mph C = 70. mph D = 80. mphE = 90. mph F = None of these(c) Trina drives 40. miles at the same constant speed as Stephanie while moving. But midway,she has to stop for 2.0 minutes at a long traffic light. What is her average speed for the trip?1920sec ÷ 40miles = 48 sec/mile, so 75 mphA = 65. mph B = 70. mph C = 75. mph D = 80. mphE = 85. mph F = None of these(d) Tammy drives 40. miles at 50. mph. But midway, she also has to stop for 2.0 minutes at along traffic light. How many minutes does her trip take? 40×72sec + 120sec=3000 sec = 50min.A = 46. min B = 48. min C = 50. min D = 52. minE = 54. min F = None of theseFor each of the following, select the answer A-D that BEST represents the motion.(e) An ant crossing a sidewalk. This is an example of __________ Motion.A = No B = Uniform C = Constant AccelerationD = None of these(f) A bumblebee sitting on a flower. This is an example of __________ Motion.A = No B = Uniform C = Constant AccelerationD = None of these(g) Wild horses thundering across the desert valley. This is an example of __________ Motion.A = No B = Uniform C = Constant AccelerationD = None of theseUse vector rA with an x-component Ax = 7.0 m and a y-component Ay = -5.0 m in the follow problems:(h) The magnitude of this velocity vector is A = __________ .(. /) ( . /)70 5022ms ms+-A = 1.41 m B = 3.46 m C = 4.90 mD = 8.60 m E = 24.0 m F = 74.0 m(i) Beth’s calculation of tan-1 gives her an angle of -35.5°. She finds the Standard Angle for rA as ________.A = 35.5° B = 54.5° C = 125.5°D = 215.5° E = 305.5° F = 324.5°(j) Steve’s calculation of tan-1 gives him an angle of -54.5°. He finds the Standard Angle for rA as ________.A = 35.5° B = 54.5° C = 144.5°D = 234.5° E = 305.5° F = 324.5°Steve just did it backwards – your sketch will show the SAME angle based on x- & y-components.mph sec/mile25 144.030 120.035 102.940 90.045 80.050 72.055 65.560 60.065 55.470 51.475 48.080 45.085 42.490 40.095 37.9100 36.0105 34.3110 32.7115 31.3120 30.0125 28.8130 27.7135 26.7225 16.0! " # g % &! " # g % &! " f $ % &! " f $ % &! e # $ % &d " # $ % &! e # $ % &! " # g % &! " # $ % i! " # $ % iPhysics 107 / Exam 1 [Form-A] Fall 2003 Page 3To Be CONtinued 2 (50,000 points)2.) Dr. Phil was on the road Saturday morning, traveling from his home in West Michigan to the intersection ofUS-30 and I-65 in Merrillville IN. The 1989 S-10 Blazer’s odometer started at 249,973.1 miles (402,206.7 km)and ended 3.00 hours later at 250,131.8 miles (402,462.1 km). What was his average speed on the way down?dkmkmkmt hours hourvdtmsms=- ===== =402 462 1 402 206 7 255 43 00 3600 10 800255 40010 80023 65,. ,. .(. )( sec/ ) , sec,,./(b) After stopping for gas, Dr. Phil has to accelerate his Blazer from rest up to 65.0 mph (29.1 m/s) acceleratingat 3.16 m/s². How much time does this acceleration take?v v at v v attvvamsmss=+ -==-=-=000229 1 03169 209,././.(c) How far does Dr. Phil’s Blazer travel during acceleration? This can be solved with or without (b).x x v t at atms s mORvv axx axxvamsmsm=+ + ====+ - === =0012212212222020222316 9 209 134 022229 12316134 0(. / )(. ) .()(. /)(. / ).Physics 107 / Exam 1 [Form-A] Fall 2003 Page 4(d) During the conference, word started circulating around that the Chicago Cubs had won their doubleheaderagainst Pittsburgh, and Houston lost to Milwaukee. In that spirit, we offer the following: During a baseballgame, the pitcher throws a ball horizontally 60 feet 6 inches (18.5 meters) to home plate, during which time itdrops by 36.0 inches (0.914 meters). How long (time) does it take for the baseball to fall?v0y = 0y0 = 0.914 my = 0ay = -g(e) Find the y-component of the baseball’s velocity at home plate. This problem can be solved with or withoutthe answer to (d).vv gt gtmsmsyy=-=-=-=-029 81 0 43174 235( . / )( . sec)./ OR vv gyyvgygyvgyms mmsyyyy20202000222222 9 81 0 9144 235=- -=- - ====-()()(. / )(. )./yy v gtygttygtygmmsy=+ -=-====+0012201222002022 2 0 9149810 4317(. )(. /