Phys 121 Exam 1 key

Phys 121 Exam 1 key - PHYS 121{FAJ 1 NAME{print clearly L...

Info icon This preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: PHYS 121 {FAJ 1} NAME {print clearly]: L?! EXAM 1 . 5d pts maximum Discussion Section {required}: ‘iou can bring a 3x5 inch index card. Only non-programmable and nonvgraphing calculator is allowed. Iiiiirite legibler and present your solutions in an organized and coherent form. Lise pencil. ‘iou must show all work, not just the answers. it correct answer alone will receive zero point. cu, 02, and Q3: Forfuii credit your solution must include a figure to illustrate the situation, description of your plan for solving the problem from fundamental equations, proper units, and an answer to the question posed in the problem. {11. Bob is driying the getaway car after the big bank robbery. He’s going 5i] mis {112 mph} when his headlights suddenly reveal a nail strip that the cops have placed across the road 150 min front of him. If Bob can stop in time, he can throw the car into reverse and escape. But if he crosses the nail strip, all his tires will go flat and he will he caught. Bob’s reaction time before he can hit the brakes is [lfifl s, and his car’s maximum deceleration is 1G misz. is Bob injail? Why? {10 pts] _._. _ fflifl _ __J_ M—%=§D% r. L11: dig/f rmjfmfl __aia) are“, _ _ _}a, (wig. rill—=3 as: 43%}, i ll all; d1.— ilé‘ Mire Mailer?! do? WW 1W9" 05%,: renew/g) a firm #1; Joli-st? £9}? penis liar 7620 all!” Hie 47::éi’l;i£ so 462?? V11=W+2fl¢XL {Afar/:2" __ fin»; {£53634 1— : {.15. f9 ex, : lg, , Hippie?) 5 #0 433W? all? ”Edi ”fl? .~ swat, : 3mm)??? HEW 33m :7 Evie/L 7rd Bill} :75 Dijfli/ f [12. A basketball player is fouled and knocked to the floor during a lay-up attempt. The player is awarded two free throws. The center of the basket is a horizontal distance of 4.21 m from the foul line and is a height of 3115 m above the floor. (in the first free- throw attempt, he shoots the ball at an angle of tillu above the horizontal and with a speed of soc mfs. The ball is released 1.35 rn above the floor. a Doesthe Ia erscore?lfnot,b howmuch esthebalmissthebasket? 1-3 ts ; 170 My #6 . we; W? mega “ via? { if Jams? ataxia/m s54 or We w/fMWd chi/laye/ersmgpfw _ % l / UgIW=Kiw5l9 | Lélzt/pflg‘fl ((U :6; 33550” RX] ll. 56x9}! 3 1‘ =3~ 35% ”/5. waffle/5 b} Draw accurately the try-t and vy—t graphs for the motion of the basket ball, from the moment the ball leaves the hand. Provide an appropriate numerical scale on the vertical axis. [4 pts] Q3. At the instant the traffic light turns green; a car that has been waiting at an intersection starts ahead with a constant acceleration of 3.2fl mfsz. At the same instant a truck, traveling with a constant speed of Illfl mfs, overtakes and passes the car. a] How far beyond its starting point does the car a???“ the troy? [8 pts] l gplpaegaawgac :fle we view/($15 3- 4f”: -_ ii}, at + 19am) algae) 5 fifiteflvt fated?) 4X 0%“ #64: = vab éaafli}: J13- ”t e MW: WW ii” r? at -= W‘ 5 ti" +19 Agate WW A? #4 may: agate (e¢)/p.fs)eflw m”. gerfilsérazw/Msfey m EM m. b) How fast is the car traveling when it overtakes the truck? {4 tits} 5 \jC-zrf Z Vaii‘l‘ a: (63+) '2: 0+(fi2%9{f3~;5)¢1ffl%w e "*5 meta m o) Sketch a qualitatively correct x—t graph of the motion of both vehicles, be sure to cleadv label the car and the truck on vour graph. [Get the shapes right, but don’t worrv about the numbers. Be sure to assume the same time scale for each graph, though} Takes x=fl at the intersection. [2 ptsi Page 3 of 4 £14. vvhich position-versus-time graph goes with the velocity—versus-time graph on the left?I The particle’s position at t—. = D s is x, = «10 m. [2 pts] ii: [mm xtmi lo 4 I 5 2 i [[5] n risi fl its] 5 ”i —s 5 m 5 [ti —m _2 I——— tc] (til {15. The motions described in each of the questions take place at an intersection on a two-lane road with a stop sign in each direction. For all of the motions, the stop sign is at the position x=El m, and east is the positive x direction. Select the correct position versus time graph for each motion. a] A driver ignores the stop sign and continues driving east at constant speed. {'2 pts]; #1! iii-rare b} A driver ignores the stop sign and continues driving west at constant speed. {2 pts] C A W“ c} A driver, traveling west, slows and stops at the sto sin. 2 ts n a i n i ”F W! d] A driver, after stopping at the stop sign, acceierates to the east. {2 pts} E div {15. Automobile accident is the number one cause of death for young adults in the US. Seatbelts can prevent death in about half ofthese accidents. Lise the knowledge vou have learned to explain whv vou should always wear seatbelt while riving. [2 ptsi NM”? and cyan ‘ emanaymman wthM/ufiflfivaflI/é em nedmfswrwrtmiiémrmji dawn; Jam/ad fasaimwd ailmenmnfizswsth/Mr and [7‘ WM nsr‘tifmi’ 53’ WJW m fit? in; iii; [HZ/ ...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern