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 Document
Unformatted text preview: Physics 2101, Exam #4, Fall 2009 November 24 , 2009
ﬁsts/ill seem
Name: W... _
H)#:
Section: [Circle one)
1 {Chastaim MWF 8:40 AM) 4 (P1ummer.TTh 9:10]
2 [Chastaim MWF 10:40 AM] 5 (Adams, TTh 12:10) 3 (Rupnik, MWF 12:40 PM] ' Please be sure to write (print) your name and circle your section above. ' Please turn OFF your cell phone and MP3 player!  Feel free to detach, use, and keep the formula sheet. No other reference material is
allowed during the exam. ° You may use either a scientific or a graphing calculator... 0 GOOD LUCK! 1. (Show your work) Planet X has amass of 5.0 x 1024 kg, a radius of 4 x 106 m, and no
atmosphere. Calculate the following quantities for a projectile launched vertically from
its surface with an initial speed of 5000 m/s. (A) (I Opts) The speed of the projectile when it reaches a N\height of l 0 x 105 m above the
.. 1L
surface? grown {A «lgK“ Mitt Kl’" MR ﬁg +1; NULL 2: A Mm §_ L1m0§ m TIE + 51"” U: 1W:\\,¢V\*ﬂ&v¥ﬁ _ 35+ RA“:
211 _ 1 1:2. as . .... ”’3 5x10
1 H_ (She éb‘) mg. +(goﬁg EQENQ 3 é£?:s1o 2. NV“? AmEQ $12 we ' Wt _
(B) (Spts) What' IS the escape velocity of the gi'oiegile from the sur ace of Planet X? .1. 013$! Q J New) Emma “m +16 Mziiﬁ '22 C) r4139” WW); *3 \1  issscﬁ Vt it 577%;
15x 1oit 1113/3 W (1th Sui/SW0 5'1, NOE"! 2. (Spts) Kepler 3 second law of planetary motion states thatﬁﬁ the area swept out by a line
connecting the planet to the sun is a constant in time, det‘ — constant. This statement is
equivalent to which of the foIiowing conservation laws? (a) Conservation of Mechanical Energy {9 % L
(1)) Conservation of Linear Momentum i : 0) Conservation of Kinetic Energy E) j 1m
((1) onservation of Angular Momentum T e All ofthe above. 3. (Show your work). In the ﬁgure below, a 2 kg cube of aluminum 1s suspended by a _ '
rope tied to a balloon which IS ﬂoating on a ﬂuid of den51ty 1.5 x 103 kg/ma. Assume the balloon has negligible mass. ( pm = 2 .7 x 103 kglm3) (A) (5pts) What is the tension in the rope? mg: Vxlé X19 Kb/ms To M3 13 M3 mm \{= 9443: 3.72 gs. continti‘img
Tia‘1"??? see  law .1 “’3 We“ WW
ulmsz N (B) (Spts) What voiume of the balloon is submerged? 301%):st ., .3
z 31 ________ 5©15€i7KiQBW 4. The ﬁmction x = (2 m) cos[(0.3331r rad/sjt + m’4 fad] gives the simpie harmonic motion
of a body. (A) (Spts) What is the . (211.1...360
(1)) 0.25 set?" C . see
(c!) 0.05 see i
(e) it is never at x = I. . (B) (Spts) What is maximum acceleration of the body?
l.
(@955 m/s2 0%: (Q (A): '2. (1\<%3
 Cit»? 2‘5 W .
a Q; €é§ﬁe 5. Theequation of a certain transverse wave on a long string is given by
y(x,t) = (0.1 m)sin(2.7tx «6911), where x is in units of meters and t is in seconds. The tension in the string is 20 N. V a Y” 3‘ M LQLX  Wt} A) (Spts) What is the speed of the wave? U :2. kg“ .3: 5i. _—_ 3
a 2.1% (a) zero, it is a standing wave
(b 4 m/s
@
(d) 0.25 m/s
(e) 0.} mfs M B) (Spts) What is the linear density of the string? \1 ..... kri— ___, “29 3; i 'Cfb)2.2kg/m> P322; hi
(0). m m (d) 0.5 kg/m
(e) the string must be massless C) (Spts) What is the maximum transverse speed of a point on thestring? V(a_)zero IVM: my?“ :(QABQW 5:6ng _ (b) 0.1:: m (e) none of the above 6. A rope of length 2 m has a transverse n = 5 standing wave of frequency 30 Hz
propagating on it. (A) (Spts) What IS the speed of the interferingV waves on the rope? $256,323 _ ?2:: ngg? V if???
531% if
3535: .:. m (B) (Spts) By what factor would the tension in the rope have to be increased in order that
the n :5 mode have a frequency of 60 Hz? een‘x/wa’ (a)1 ewe/aw we“
63:? _ 7 V 1L 23— t)
~(c)4 i ~ . (e) 100 7. (Spts) A physical pendulum consists of a 0.5 m rod of negligible mass that is connected . to the center of mass of a 5 kg irregularly shaped object on one end and connected to a
pivot on the other end. When the pendulum is set into motion it is observed to oscillated
at a ﬁequency 0.6 Hz. What is the moment of inertia of the pendulum? (a) 5.1 kgmz
”(glass 7 2 8. (Spts) If two objects are in therrnai equilibrium, then which of the following statemlents: must be true? C1”: r73 (a The musthaXe the same Wintem 1 energy
,) They must have the same tempegaltarsetsw7 msgaw I 'cTTﬁ‘ey thirst have tEWW esame heat capacity
(d) They must have the same mass.
(e) None of the above. 9. (Show your work) Gas within a chamber passes through the cycle shown in the ﬁgure.
The BC leg is an expansion where no heat is transferred. CA is a compression at constant
pressure and AB is pressurization at a constant volume. For this speciﬁc case the heat
added in AB is QAB= 20.0 J, and the total work done in the cycle is i1 5 J. (A) (Spts) Is the total work done in the cycle positive or
negative, explain? (tract: miss go gr llEQ; Pressure (B) (Spts) How much work is done in going from A to B? 0 News Awe Volume (C) (I Opts) Determine the energy transferred in going from C to A. ﬁre/357% lies r ism» me a: Q
SQ CP/Ae‘l‘QeQO: WAﬁ‘VWRC JFWCA 2®+o+szl§i ...k,_i,mn=:—«. xm.ss.mm:mwm _ 10. (Spts) How much heat energy 'i's'requi ed to turn 0.3 kg of water at 20 “C into steam at
100 0C? _ 6.2;!
triﬂe {2% :1 0° C “.3; merge l or; it.
(a)3.0‘x106.i .. m. .. f; 00326 m
(b) 2.2x 10:; q e; C m A\ .1. Qil‘gOEQaS) T0 i ) 0 meme m: 390°? mews . t. 51....
, .._ '4’ i 2‘: , 7NOQ
q) .2. Mm “02,154 We %](O:3l<§§ £7 e a“ '1'“ )7.3x105J " ...
View
Full Document
 Spring '07
 GROUPTEST

Click to edit the document details