103s07solns1 - Name 55 “110335 StudentID IDCODEA Section...

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Unformatted text preview: Name: ' 55; “110335;; ' StudentID#_ , IDCODEA Section # - TA Name Fill in your name, student ID # (not your social security #), and section # (under ABC of special codes) on the Scantron sheet. Be sure to fill in the letter for the ID code on the upper right of this page for the first question. This determines which version of the test you took, and it is very important to get this correct. Make sure your exam has questions 2-21 and 6 total pages. Physics 103 Midterm Exam 1 I ' February 22, 2007 Multiple Choice, Closed Book v .. p Circle the letter of the choice that best completes the statement or answers the question and also mark this answer on your Scantron sheet. You must do both. Please be very careful with the firstquestion: 1. ENTER THE ID CODE ABOVE IN THE UPPER RIGHT CORNER ID Code A :. ID Code B C. ID Code C D. ID Code D E. ID Code B Name: Student ID# 2. In mechanics, physicists use three basic quantities to derive additional quantities. Mass is one of the three quantities. What are the other two? ' ~ a. length and force b. power and force @length and time d. force and time 6. length and velocity 3. Suppose an equation relating position, x, to time, t, is given by x = b P + c t4, where b and c are constants. The dimensions of b and c are respectively: a. T3, T4. b. 1/T3, 1/T“. ‘ L/I‘3, er4. . L-T, L-TZ. . e. Lz-T3, UT“. 4. The distance to the Andromeda Galaxy is estimated at about 2 x 106 light years. A light year is the distance traveled by light in one year; if the speed of light is 3 x 108 m/s, about how far is it from our galaxy to Andromeda? (1 year = 3.15 x 107 s) a. l x1016m b. 1x1017m c.1x1018m x1022m e. 6 x1012m 0| :: avioéflw x 3.1% we" S/Ag x 3K/Ogm15 “2.2. La“! X10 M Km:- Mum 5. Displacement is which of the following types of quantities? vector . scalar c. magnitude d. dimensional e. none of the above Name: Student ID# 6. A cheetah can run at approximately 100 krn/hr and a gazelle at 80.0 km/hr. If both animals are running at full- speed, with the gazelle 70.0 m ahead, how long before the cheetah catches its prey? we m- = ,W». r . woos/2.»: 0.6.305 . . d.21.4s 1.; “Les ' e. 10.7 s 7. A 0 vs. 2‘ graph is-drawn for a ball moving in one direction. The graph starts at the origin and at t = 5 i s the acceleration of the ball is zero. We know that at t = 5 s, a. the slope of the curve is non-zero. @ the slope of the curve is zero. c. the curve is not crossing the time axis. (1. the curve is atv=0, t=0. e. none of the above ’ (1:0 1f achs‘tah't 8. Cessna aircraft has a lift-off speed of 120 km/hr. What minimum constant acceleration does this require if the aircraft is to be airborne after a take—off run of 240 m? w ‘53.: m 444%,?" t. a! ’ . “2,; My; as gag. a. 1.15 m/s: . p .. 2.31 m/ ' z - (:33 53 In/_:2 . AL: ___ ((2253 fiwflfix.n\ K (mom Z ' ' :p— w W I hr... at. d. 4.63 m/s2 0‘ 2 5 3 x mm m 36m far/fl?” ~ ' e. 5.55 m/s2 2,31m/5 “I m 9. A baseball is released at rest from the top of the Washington Monument. It hits the ground after falling for 6.0 s. What was the height from which the ball was dropped? (g = 9.8 m/s2 and assume air resistance is negligible) 36371 C9 2 —- ' r V .3... 2 a.1.5x102m X “X; +«}/ 2 ai- @1.8x102m c.l.1x10m ‘ z .d.2.1x102m .. If»??? s: T‘ze-xwxgé e.3.0x102m ' N ante: . Student ID# 10. A taxicab moves five blocks due north, five blocks due'east, and another two blocks due north. As- sume all blocks are of equal size. What is the magnitude of the taxi’s displacement, start to finish? a. 10 blocks 2 ‘ b. 12 blocks £3 ’ . 2’ p _ .9.8bl k :23) 7} V__ W (CI. 9.2 bIEZk: 5 v . i//\" 73“ +5 71 -—- fiwzfi .6 blocks :: % . 6 11. A baseball thrown from the outfield is released from shoulder height at an initial velocity of 29.4 m/s at an initial angle of 300° with respect to the horizontal. What is the maximum vertical displace- ment that the ball reaches during its trajectory? 1 2:. “- "E i” a} a. 4.50m "m L=iL€3§ $69. 5 1 @11.0m I . z I 0. 9.80m ' O Ufa filth 9) -— d. 22.1 m “2 , , ’2 ' e-‘Wm jazz WW _..... 2% was: .. I, am _ I 3' 3a m ’ 12. A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at an equal shoulder level) by the catcher. At what point is the ball’s speed at a minimum? (air resistance is negligible) v s e ' M. QM“: Jim“? [:1 ’ Camfo n e w‘f a“; U a. just after leaving the center fielder’s hand' b. just before arriving at the catcher’s mitt L 3 fan STA Wt ; iv 8MB \c‘ai ‘ c. one quarter ofthe way to the catcher V C ompon & h f a @at the top of the trajectory e. speed is constant during entire trajectory S m A E? 3"? {a E? V0) {Tr} o—i “the? fraiea'tmb.‘ 13. Wiley Coyotehas missed the elusive road runner once again. This time, he leaves the edge of the cliff at 50.0 m/s horizontal velocity. If the canyon is 100 m deep, how far horizontally from his starting point at the edge of the cliff does the cOyote land? W 2. mg; g r @100m A x "2L ‘Z‘l‘ WV} 7*" =3 w/E’Tfl/fig ‘ 226m . 4.... . , c. 247m x :r'. '7); 7f” a...“ 5G ,quggr 226 m Name: Student I]_)# 14. A stone is thrown at an angle of 30° above the horizontal from the top edge of a cliff with an initial speed of 12 m/s. A stop watch measures the stone’s trajectory time from top of cliff to bottom to be 5.6 5. What is the height of the cliff? (g _= 9.8 m/s2 and air resistance is negligible) ' ' a.58m Ali? 4“ (Lgxésf '4’ b. 154m 7 i ‘ I Azg >©120m O 4- “lg/‘1: 5““9 ” iffii d. 197m “ e.240m 1L :- Jz—ggtz ulgj Sine :nggxaézw :2 magmas : (20m 15. A river flows due east at 3.0 m/s. A boat crosses the 300-m-wide river by maintaining a constant . velocity of 10 m/s due north relative to the water. If no correction is made for the current, how far downstream does the boat move by the time it reaches the far shore? at :2 was a.6m b.30' 960$ (“S—U4? z: figs/’15 :1: @90111 K 'r .x '- “(I 551. e.120m 3:" 952 W": 16. If we know an object is moving at constant velocity, we may assume: . . . w». , 1 @ the net force acting on the object is zero. z: it} v...‘ a “a: b. there are no horizontal forces action on the object. ' 0. there are no forces acting on the object. 1:; W fl (1. the object is accelerating. W M e. the object is losing mass. ' “g ' M5» MW 3:“: Wait M O 17. A cart of weight 20 N is accelerated across a level surface at 0.15 m/sz. What net force acts on the wagon? (g = 9.8 m/sz) ‘ a. 0.92N F "3 PM» 2:: %* a. “3:; @031 N was c. 1.5N .1 o . . d.3.0N :13: wq X 0.1:; I: 0.306; N e. 4.5N p Name: Student ID# l8. Rita accelerates a 0.40—kg ball from rest to 9.0 m/s during the 0.15 s in which her foot is in. contact with the ball. What average force does she apply to the ball during the kick? ‘ f A’U’ 5% .48N F :3: that 3 m “j; a; a M 1:72N ’ ‘ A”?! '9‘ “53"?” ©24N ' d. 60N 3:: 2 g. N -e.30N /m: /”2 19. A 10—kg mass and a 2.0-kg mass are connected by a light string over a massless, frictionless pulley. If g = 9.8 m/sZ, What is the acceleration of the system when released? .2.5m/2 marzm ‘w‘l” i: 4.9 m/:2 I ' 65 at c361 ©65m/s2 M261 '3?» "We N133 d.7.8m/s: - e.9.8m/s {mph man, :1” (m, —m3\ 5% hfigmlbfla g 1:: mmeme *w" “3:1 M “ (w v 2_ maul-‘m? \ H7 20. A block of mass 5.00 kg rests on a horizontal surface where the coefficient of kinetic friction be— tween the two is 0.200. A string attached to the block is pulled horizontally, resulting in a'2.00—m/s2 acceleration by the block. Find the tension in the string. (g = 9.80 m/s2) a. 0.200N Twink! We. . b. 9.80N ‘ fl A ,c. 4-9N 2:3: mim- ‘Al N “:3: W15; 49 A! mfg @19.8N I ' e. 10.0N W163 :7: +‘é'PWQ’BB .4 g: 2:... lg» g N “(If I 21. Jamal pulls a 150-N sled up a 280° slope at constant speed 5 force of 100 N. Near the top of the hill he releases the sled. With what acceleration doe it sled go down the hill? a. 1.20m/s2 F 3"“ W 5109 4" g $ $1.1: F--»W 5E.er 2 l ' w Sm a a»? 1:: ma. _ 2 v v . W Ema v F + warm; :2. ma (1: (Etxr’éfimfi ~F’) :: 3,9(2x owme— ...
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This note was uploaded on 12/23/2011 for the course PHYSICS 2130 taught by Professor Zhixianzhou, during the Fall '09 term at Wayne State University.

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103s07solns1 - Name 55 “110335 StudentID IDCODEA Section...

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