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Unformatted text preview: Physics 2211 Quiz #2 Form #211 Name: "g A“; ' WI ________._
Spring Elli]? Version A Print your name. lest form number {3 digits at the. top of this form]. and student number {9 digit Georgia Tech ID
number] in the section of the answer card labeled “Student Identiﬁcation." Bubble the Test Form Number in columns 1—3, skip column 4. then bubble your Student Number in columns 5—13. Freeresponse questions are numbered I—lII. For each, make no marks and leave no space on your card. Show all your
work clearly. including all steps and logic. Box your answer. Multiplechoice valuations are numbered 1—6. For each, select the answer most nearly correct, circle this answer on
your test, and bubble it on your answer oard. Do not put any extra marks on the card. Turn in your tart and answer card as you leave. Your score will be posted under “Course Standing" when it has been
graded. Quiz grades become ﬁnal when the next quiz is gitwen. ‘r'on mayI use a calculator that cannot store letters. but no other aids. 92....1. — Bﬁmfsg
All problems take place on Earth. Unless otherwise directed, drag should be ncglccted. . {16 points] A. esng hall hangs [mm a string. ‘r‘il'hen a horizontal wind blows at 18 millsT drag makes the hall
swings out so that. the string makes an angle of I9 = 20” with the TFertian “that. angle does the string make with the Tvertical when the wind blows at 1'2 mr's? . 'l"
FfRc Ed! JY fDl ajrqm le'i'lM‘I 51:.ou L.“ ipxwilErﬁﬁr=o Form #211 Page 1 oi'5 ll“. (16 points} a block of mass m is placed against the vertical front of a cart. and the cart is accelerated forward
with an acceleration of magnitude a, as illustrated. The coefﬁcient of static friction between the hloek and
the cart is 1.5,, while the coefﬁcient of kinetic Friction is lug. What is: the minimum acceleration magnitude a required to prevent the block from sliding down the front of the cart, in terms of any or all of m. 11,, it,” and
physical or mathematical constants? Free Enlist {Illicit4M
13: U Nﬂwm“ ritual LW fFx: )1 I: may 1. {6 points} imagine that instead of the minimum acceleration magnitude e determined above. the cart has
a greater acceleration magnitude 20.. How does the magnitude of the frictional force on the block when the acceleration is 2:: compare to when it is a? it
. . = W
a) The frictional Force for 2a is half as much as the frlctlonal force for e. I 1 WWI”: Form #‘311 Page 2 of 5 III. [15 points] A block oi" mass m. = 12.0 lag is sliding deem a ramp that makes an angle of ti 2 13“. as illustrated.
The cooﬂioicnt of static friction between the block and the ramp is £1.43. while the coeﬂlcient of kinetic friction
is 0.42. At the insmnt illustrated, the block is sliding downward with a speed of 6.6 infs. How much time.
at. is required for the block to slide 5.131 m? Fri4 El Jr vtgﬁfﬁh ﬂewl1...” ﬁend Lou t....,..ms.w 1.“: page __,Mqu wristHag .=? like“ a (Emit? 1.4% W”) .1 1?“,{4 (m, is“ our: tieital) . —0.H "ii" t (Miami: A‘H’k‘ri'lﬁ Kailewd: ““dfrn‘lW" H’ :11! yin“: YﬂklVm be +£ﬁxﬁeel'“ 'I {:qxf'sef Hams tfmsclea Qty: *Qﬁﬁt‘ ’1 ﬁudH‘lR "I I“
M!
ewe. Eié .r FF Etvm? t
360:” afa —._—J—:—_' thr‘ H' Eff'1!“ :. ﬂ.ﬂhr"§'i1 K: 5.6“: E 3" key 1‘ ‘éiﬂn‘l' at= n~ iMJ C= ViiX u so“ I'LGI 'l‘Cle‘l'kJ'l *Hulf “h qug ﬁrpuah J'Lu...l Pupha... uh “I”? LEI! 1E Plﬁhg.‘
Mgr" PHY‘HEI MfgIlia, 2. [ti points} The block in the above problem will not slide 25 n1. If the question had oslocd1 “How much time,
ﬁt. is required for the block to slide 25:11?" how would your solution for n; indicate that the block doesn‘t
tictusill}.r slide that far? if
{a} it: would have two positive values. 5M” '3: "'1" q“ "‘ I"?! [h] A: would he undeﬁned [division by zero}. if” *3" Mn; Lie;le Hlps in:
[cl ﬂit would be zero. In“.
:1] ﬁt. would be imaginary [square root. of negative value]. i
{o} it! would be negative. Form #211 Page 3 UTE 3. [it] peinte] If you threw an object straight upward and catch it en the way dewn, where1 if e..r13.c"I.I.«'l'iere1 is the
magnitude [Jr the acuelerution the least? De NOT neglect drag! [3.) Just before you catch it. {h} At its highest pnint. {e} Just after yell threw it. {d} The magnitude of the acceleration is the same throughout its ﬂight. Fr 2: Bid}: Juﬂ‘ gillpr “hr1‘. in; Til” JHE" Efﬁe («Huh
D
in i
i. 1" I" We} £61”, I“!!! re aftederqiiﬁdl IJ‘ Jim! Jl;i+ Led"re Cieleh. 4. [11:1 paints} An object is moving to the left. end is experiencing a net force directed to the left. The magnitude
ef the ferce decreases 1«with time. The speed of the object. a) decreases with time. i
{b} ﬂat aim quiet—i =2; “mime”; 4. {.4511
i c} lscenstant 1n time. ﬁﬂ'jpnﬁlﬁ In S'wf ££ﬂ+lh It: vegﬂ‘ﬁr metHI {aid(J? wide MIL Farm #211 Page 4 CITE 5. {112] points} A person with a weight of Bill] h‘ is in an elevator, standing. strangely,r enough. on an ordinar}r
bathroom scale. The seale reads 330 N. Which direction. if any. is the elevator traveling? {a} The elevator is moving downward. {h} The elevator is moving upward. [e] The elevator is stationary. {d} The direction cannot he determined from the information provided. "II'IIrIﬂI'I‘l W Free. Ea J}: Diagram I
l1 3'“ I 5.9 ftgl‘ first aim! quelsref‘iih are up, in; windy (ﬂuid Ind gtﬂdr may . «trl. HFJ alluqdlr ﬂ ﬁpdﬁa’iﬁ up; I‘l:I iii
dawn lovefr L'S Slowi' dlwu. _ .f
i l a Spring Scale ﬁ. {113 points} a person gives a shopping tart a push along a horizontal floor to get it moving1 then lets go.
The cart travels forward along the ﬂoor. gradually slowing as it mores. Describe the horizontal fem on the
cart after the person lets go, while the earl. is moving forward and slowing. {a} a haekwsrd foroe is acting. with a magnitude that is oonstant in time. {h} Both a forward and a hat: war oree are acting, u t 1e orward oree has greater magnitude. [12} Both a forward and a haeltward foree are acting. but the haekward force has greater magnitude. {d} Only a backward foroe is acting, with a magnitude that diminishes with time. {a} Both a forward and a haekward force are Ming: but the forward force magnitude diminishea with time. ﬂ ﬁe: .3pr “Dinads»: Felling Ivaa. caer gathered
r I? i'J tmlh'ﬂl‘ Ti 'flﬁi‘r‘. Form #21] Page ii oi 5 ...
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