This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: ~> PHYS 122 Exam I September 30, 2011
Prof. S. M. Bhagat Name: 5 at, (47(5) A/ (Sign in ink, print in pencil) 'Notes 1) There are four (4) problems in this exam. Please make sure that your copy has all of
them.
2) Please Show your work indicating clearly what formula you used and what the symbols mean. Just writing the answer will not get you full credit. In stating vectors: give both magnitude and direction.
3) Write your answers on the sheet provided. 4) Do not forget to write the units
5) Do not hesitate to ask for clariﬁcationat any time during the exam. You may buy a formula at the cost of one point. Take Care! God Bless You! .90 = 9x10“12 5
m
Mass of proton m p = 1.63510‘27 kg
I Mass of electron 1 me = 93610—31 kg Elementary Charge 6 = l'.6'x1 0'19 C Problem _1
A spring mss oscillator consists of a mass M attached to a spring of spring constant k and placed
on a frictionless horizontal table. The spring is unstretched at x=0. , uw.rwfmfa’”'Z$MsbMW wag4gnmpumam...w.uw.m.u«y ' ~ ‘ ‘ a) If you pull the mass to x=A and release it, why does it oscillate? (7)
b) What is its potential energy at x=A? ‘ (5)
c) What is its kinetic energy at x=0? (5)
(1) At what value of x is its kinetic energy equal to its potential energy? (8) 4;) B€CQU><5Q W’QJ'E/“n Op" ‘9‘ Mlﬁmgigwe’ LI!“ Lg i=3,— k>< Q
’5’: \ ‘0‘? X‘
“Wm/LS “A ”of” law 7
7/3,. , Emaiﬁ Pfﬂﬂ‘
. vcafﬂﬁd A a m'%.
mi; w hm“ A P a
loam? Pswgmz ‘Sb W W
W P ~
\ [email protected]
M W7»? ‘5' r
Claw?“ X“ “M 2. ,2
é: “Al/mas: 5'” #22, “A ﬁg) dawwata/M’im 43“: 5:1" W5 3.
I ' 2. 2.
__L Lﬂ2:%‘gMVf»3’:k¥ 2 [PE {wmwd'bk i/zorf4°+M'
”1:; KEg"\z ,Lkﬁ‘rz‘
" 1;“ " 55;: A 2
_ 3621. 22 4E; Problem 2a
As written below the expression for the deviation from equilibrium D has several quantities missing ,
D = ...sin(x—vt)
here
D is a physical quantity
x is a length
V a speed and t a time Problem 213 ‘
A wave is written as P =10N/m2 + (10.1N/m2)sin(kx —a)t) (i) Looking at the unit, can you tell what variation does it represent? (5)
(ii) Can such a wave exist? Justify your answers. ~ (5) u 1‘ WW'ﬁ Problem 3a
What is sound? (5) meﬂ/‘W% [4:62; ¢Q7lzd£€w
:0 H27: alt/7d ZOJZJU Problem 3b
The speed of sound in a gas is written as Vs : {7,6371
m C
Why is there a y(= CP ) in this equation? (10) v ‘ (M7261 dqmmwﬁy Mam. 311$ WXpﬁwcemwwk
' ' 40$ Va
, Vets/101.333! M ftx‘mg hﬂw/ 
Q3 C’L l/ﬂ/eewnczu 61“ «mar. ”I I (‘3'?)
.M«e. wiimﬁe; , , "‘ . {’ 14%. q w weak: . a
amen/2 rwuw we)“; aﬁmgebqawﬁmmgmep 543mg: 1'5 a: L5 _
@114, S Me, [Xxx—L jzvoaw
a 5%,; & ted—u; PM max 549 Minere r55 m1) "' w
I ‘ .. ,
MELVMQVQ £155 Adhbwwmw
6mm 14131‘473 1477K: By
a; Pwv
ﬂux ,4 ﬂ awe/0‘12“»)
W P 1/ Y5: WE Mb“ Va EB;
<1 Problem 30
At t = 0, draw a periodic sound wave as (i) a displacement wave and (ii) its corresponding
pressure wave. . . » » (3,7) 5 r. 5,; Sn: (2%»wa Egg) 5: 3% 5L»: “)4: syawnsssvr—z—zwmwmrnmawmmﬂ ,. Problem 4a
The Coulomb force is written as Show that this equation is consistent with Newton’s Thirds Law of Motion. ‘ (5)
Nam/i7: wk 3%” [emu semi/3 1% 47,03 eta/“mmﬁ MM;
W W Wmmwaﬁﬁm m M aﬂww We
Wm «a Mmymﬁlbﬁﬁs PWE“ £7?» 3" r“ in“; Hwy a?“ hi rm: 5% ,3“ ca , tea, @545 erama,
”(we {Mam aw M" 2%ng élﬁw
“3% a» mu
\ M? ‘5
9,! 3Q» '  "W
" v «4.
ﬁg 1 a” ”ﬁx/Al WKM/ I 74
Q\ at 572/7,
Problem 4b .
How would you discover the presence of an E ﬁeld? ' (5) Problem 40 .
A Charge of ~— ZOyC is sitting at r = 0 and a particle of mass 0.1kg is going around it in a circle of radius 0.25m at a speed of IOm/s. 13What is the charge on the particle?
(15) r . , V W W.%M
Yamgaﬁ, R W744» 515mm“ :4 , . Cquim‘inmk. we («wear
. h { MVZ
Hat«m. «2 “ii/:23; ,3 W
,. MV‘ZP = 0 / W0) xﬂ'gf
72 " 7W.“ “:3
ke’W/l qx/pfx Zaxro ...
View
Full Document
 Fall '11
 Bhagat
 Physics

Click to edit the document details