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# exam1 key - Physics 111 Exam 1 Name C;£:7 Remember units 1...

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Unformatted text preview: Physics 111, Exam 1 Name:_ C;£:7/ 10/5/01 .____..-—-"" Remember units. 1. In a drag race, a car accelerates constantl y from rest, traveling 120 meters in 8 seconds; Find its . ‘ ,r‘ a a. average speed c b. acceleration :B-WSWV ‘ U) ; niz—é-ai‘f' 2. ‘ject undergoing constant acce ation starts from est1 reachi n ‘Wal speed of 30 m/é} covering a distance of 450 mete . Find its a. time of travel. CBC-EQCCWQC b. acceleration *WVgé U : [tie at : ‘2 4: 1.2-: a “.é‘Q-‘J" i a; I C 3C2; C:;,+ECI (45;! __ O 1 .4. E. I a 900 2 900a ’ 3. An object isﬁ/Sgﬁéd, from a cliff, falling [email protected]\ seconds. Findnitsjjgzc —4/ a. final speed 39~Envb b. the height of the cliff qg~qWW (I: 3.0! R": ._ " : _.‘o4 I! i i <3 4. An object’s motion is represented by the x vs. t graph shown. a. What is the object’s axerngguﬁpgggnfrom time t—Os to té4s? ’ ' f . ‘1’ lm/é San H‘ﬁm/ , — Leg: 9 In I} ~— - - p . . \ /"'“‘x 1 b. What is the average speed from tlme t Os to teigs? Ch m Gwﬁ - x f“ I ‘.._i . b Ti"? [ESEC ’” 5. An object's motion is represented by the v vs. t graph shown. firstgthreeyseconds? b. What is the object’s instantaneous acceleration at t=Ss. 6. An object is launched wit angle of(é2fgwith the horizontal. a. (direction_before it strikes the{ground? £0.83 eggs: 3 a velocit of 6E:§;s at an Y / / : CLﬁma/fsa} \J How long is the object in the air before it hits the ground? (:///. l'qtcf'i i”: '3 - A ' G harmonica; 5 8%.9n1/5_ What is its velocity at the top of its arc? ( DIM/3 CL/ jE‘r-ihfn: _ What distance does it travel in athgrizontal / BLWW U At what angle with the horizontal does it strike the ground? 3C": in, = Wavy; G = 30* Fr“ .. Jug-ft? — Iq-Fr ‘— E @8300 'Q” 3/ . e ""5313 «r‘ I —» r-LI-.‘ ,1/ "J "" W J ; .a” ‘UTLI '. W I ’3’ I" § aﬁc" G 1 U -"'_.rv._‘ . . - I ' ' a! 1/ 732,-!» z ' i “:43? ~~ '1 _ . - _. ,7 if, ' _u~ : I K, ' \$row. %F,O 0» “re T; (ﬁésmsckng:'>3 ' i :‘SSEi: x M in / q : (“~ 2:2» )\ to 2: gm 7. A 400kg mass and a Gookg mass are connected by a string over a pulley as shown, a. b. What is the tension in the string? ::. {\$WOEL 1-1;;Mgﬂﬂﬁ ﬁrwfﬁ and held in place. C A .x A a :1: 3,1! L3 89‘ ‘ trill: .1 What is the acceleration of the sz:ief’when the masses are allowed to move? ormq’a llﬂchuo LWO us: w~a _L —_—; r .' T [‘08, [Tao T: Llo 0014,40 :32th 5:393 =(uo 0; (“O 0W“ “W EC%=1'JCG : 4W0ﬂ+ : WWO ‘ 0.: r— 1 06 ________,, 9. A block is placed on a<E£igggggiesstslope as shown. (ﬁ: a. What force along the slope is needed to move the block up the slope at constant \r'elocity'i‘itiarm”.3 ! GOEH, I n | u I u If the coeff1c1ent of kinetic friction between block and the surface was 0.2; what force would be needed b. O, | Q Va“. - Cd /—« mi. . "L , to move the block up e slope at constant velocity?f}Ta3R; A plane i: flying duecﬁogth’at<3§§:£;2h;¥ Anggosswind in the \erly direction is blowing at /6fhm/h‘: Find the a. speed of the plane relative to the earth -506lQM/hr b. angle the direction of travel makes with the east direction {'3 C o{ . rig rams; Udoct o? ﬁﬂﬁﬁ Qwﬂﬂﬁ d“"" i 3‘ ‘ hmww’WfT L ’ 4 n", z 9003+ i [/1— L I *‘ _ (3 EC 80l§l~%q 3 C05: 3 : Sb L G 8 E 5 U) Qacrnﬁnrtiﬁrwn,~s rm%:{3 B ﬁmhmhgt§ J I _ “ I‘ ":""a ‘3’“ A ' e T— m sir 33“ z i“: pp- :3 .— 3; u ‘ i. i. la V U 4 i i g ‘7— . .. ,5 : -S~‘ﬁ1—;Er‘n Tuﬂriﬂci 3 G: ‘(n1&_\$§i(*::? .Fb 1| vb, / < { ET:de l ____________ re _ ‘ .7 ._.._: _{|CO (ago)81‘n3>c .. laggimﬂw H w : Jw o\a)(_too,10_t:c;r:- e; 563 f r‘ A? W30 H ...
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