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Unformatted text preview: Total grade: C {100 PH 1110 Summary Homework 1, A Term 2007 Name Section Number This assignment is worth 2.5% of your ﬁnal grade and is our recommended means of assessing
your readiness for Exam 1. It is due in conference on Thursday, August 30th and will be returned to .. . :you inconference on Tuesday, September=41”, the day befOre Exam '1;'Please show your workand report your answers to no more than three signiﬁcant ﬁgures. 1a. [15 pts] During freshman orientation, a new student, W.P.I. Geek III, is given instructions for a
treasure hunt: A: Walk 300 steps East.
B: Turn 53.1" towards the North and walk 500 steps.
C: Turn to face Northwest and walk 141 steps to ﬁnd the treasure. On the graph below, sketch vectors that represent steps A, B, and C, assuming the student started
from the origin. Label them. Also label the axes (E, N, W, S) and scales (number of steps). M Esters] 19150 lb. [15 pts] What is the vector D
representing the direction that the student
must take to return to the starting point?
Sketch it on the graph, and express it in
both i, j notation and as a magnitude and
angle with respect to East, measured
counter—clockwise. Place your latter two
answers in the boxes below. ’5 [SW3] we» so: A A
A = 300:.  A .
E9 : FocaesaS'BAftﬁ’oosm 55.1A 3300; +400)
‘5‘ 5’ a; A ‘3“ ~ HI em 1535’; tI‘Hsﬁn 13s a: Hashim?) . .1 A 5 :
4.5+C/ :: 5006 4: 5—003I Ste,“ 4C”, #1900  _ ' ‘5 __ A A
D: (hrbODL. *SOGIA\M  o
D :ﬁsgssaegccg a} 2:356 I lo. [10 pts] Express the direction of D as a unit vector. Place your answer in this box: A D erFZ—Oq— {'3 at 0/40 _ Points earned on this page: H Summary Homework 1, continued. Name Section Number 2. W.P.I. Geek III makes the following measurement ofvx(t) of a cart on a track during Lab 1: Vx(t [cm/s] 12 13 t[s] Ax(711)= Ax(1113)= 20, [10 pts] Assuming that the cart started at position x!) = +100 om, what is its position at t = 13 3? Points earned on this page: LE 0 I40 Summary Homework 1, continued. Name Section Number 3. [20 pts] W.P.I. Geek III makes a measurement of vx(t) of a cart on a track during Lab 2, but for some
; reason, the x(t) and ax(t) data are not recorded. Sketch x(t) and ax(t), given the vx(t) data below. Be sure to label and scale the y—axes. 96669452 Von d».me k. (9‘). 12 . ' I . Points earned On this page: 20/20 ...
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 Fall '08
 Kiel

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