final exam phyiscs
TRANSCRIPT
-
8/11/2019 Final Exam Phyiscs
1/6
Ph\sics
2210 Fall2012-
Novcmbcr 2
David
Ailion
Unid:
________________________________
_
Final xam
DiscussionTA: Bryant Justin Will Yuan
1
SHOW ALL WORK!!
Place answers in box provided
or
each question. Specifyunitsforeachanswer.
Report allnumbersto twosignificantfigures.
Circlecorrectanswer(s)foreachquestion!
A. [5
pts.] Which
of
thefollowingaretrue. Circleallcorrectanswers.
Simpleharmonicmotionisalwaysduetotheoscillatory(backandforth)motion
of
springs.
Gravitationalforcesmayresult
in
simpleharmonicmotion.
c) Theangularfrequency
of
amassmattachedtoaspring
of
springconstantkin acontainercontaininga
viscousmediumisgiven
by
ro
;
.Jk
1m
(d)
Aphysicalpendulumconsisting
of
alargeuniformstickof massm is oscillatingwithanangular
frequency
ro
aboutapivotpointnearoneend.
If
thepivotpointischangedtothecenter
of
mass,the
angularfrequencywillbeunchangedbecausethemoment
of
inertia,themassm,andthelength
of
the
stickareallunchanged.
(e)
Noneof theabovearetrue.
B. [5
pts.] Which
of
thefollowingaretrue. Circleallcorrectanswers.
Afigureskaterbringsinherarmsto increasehermoment
of
inertia.
Thedirectionof thetorquevectorisalwaysperpendiculartotheforcethatcreatedit.
(c)
t
is
possib
Ie
fortheangularmomentumtovarywithtimeeven
if
theexternaltorqueiszero(and
constant).
(d)
Thereasonthatwecanuseconservationof energyforarollingwheelisthatthefrictionforcedoesnot
resultinatorqueaboutthecenter
of
mass.
(e)
All
of
theabovearefalse.
C. [5
piS ]
In anisolatedsystemof twobodiesthatexertgravitationalforcesononeanotherandmoveinelliptical
orbits,whichof thefollowingremainconstant?
Thetotalenergyof thesystem.
Thetotalangularmomentumof thesystem.
(c)
Thespeedof eachbody.
(d)
Thegravitationalforcebetweenthetwobodies.
(e)
Noneof theabove.
-
8/11/2019 Final Exam Phyiscs
2/6
h ~ s i c s
2210 Fall 2012- No\,cmbcl'
21 David
Ailion
Unid:
_
Final
xanl
DiscussionT
A:
Bryant
Justin
Will Yuan
SHOW
ALLWORK!!
Place a circle or box around
each answer Specityunitsforeachanswer.
Report
allnumberstotwosignificantfigures.
Problem1- Continued - Placeanswersinbox
D.
[5
pts } Calculatethevalueofgfora
2.1
kgmassataheight1.32
x
10
4
km
abovetheearth'ssurface.
J:::
q
fvlc
E.
[5 pts }
Aspringof springconstantkisattachedtoafixedpointPonasmooth
p
inclinedplane
of
anglee
=
30. Whenamassm
=
2.4kgisattachedtothespring,
asshown,thespringstretchesby4.8cm. Calculatekin SI units.
-
8/11/2019 Final Exam Phyiscs
3/6
)::1\ id ilion
Vnid: ----- _
inal xam
Discussion TA: Bryant Justin Will Yuan
2
SHOW ALL WORK!!
Place a circle or
ox
around each answer
Specify units for each answer.
Report all numbers to two significant figures.
. -
l
t
h .........
A playground is on the flat roof of a city school, 7.00 m above the street below. The
I
vertical wall of the building is 8.00 m high, forming a 1.00 m high railing around the
playground. A ball has fallen to the street below, and a passerby returns it by
I
d
I
launching it at an angle of 53.0 above the horizontal at a point 27.0 m from the base
of the building wall. The ball takes 2.20 s to reach a point vertically above the wall.
(a)
[7 pts ]
Find the speed at which the ball was launched.
(b
[7 pts }
Find the vertical distance, h, by which the ball clears the wall. ~
(c)
[ pts } Find the distance, d, from the wall to the point on the roof where the ball lands.
-
8/11/2019 Final Exam Phyiscs
4/6
Name: _-= - - -=-
-- - -.>,--
Vnid: _
Final xam
Discussion TA: Bryant Justin Will Yuan
SHOW ALL WORK!!
lace a circle
or
box around each
answer Specify units for each answer.
Report all numbers to two significant figures.
A physical pendulum consists of a solid sphere and a rod that is rigidly attached to the sphere at
point Q, directly opposite to the pivot point
P
The sphere has radius r and mass m, and the rod has
length L and mass M.
3
-
8/11/2019 Final Exam Phyiscs
5/6
)a id
Ailion
Name:
G \ A _ ~ ~
_ > _ ~ - ' - ~ ~ . _
Unid: _
Final xam
Discussion TA: Bryant Justin Will Yuan
4
SHOW ALL WORK!!
Place a circle or ox around each answer SpecifY units for each answer.
Report all numbers to two significant figures.
A block
of
mass m
=
0.20 kg is at rest at the height h
=
4.0 m on a smooth inclined plane as shown. It slides down onto
frictionless surface and collides inelastically with a second block
of
identical mass. The velocity
of
the first block
immediately after the collision
is 1 3
its velocity immediately before the collision and
is
in the same direction. The floo
to the right
of
the second block is rough with a coefficient of kinetic friction lk
=
0.50. As result, the second block slide
a distance d before coming to rest.
(a)
(b)
(c)
-
8/11/2019 Final Exam Phyiscs
6/6
Name:
Unid: _
Final
Xam
Discussion T A: Bryant Justin Will Yuan
5
SHOW ALL WORK!!
p
Place a circle
or
box around each
answer
Specify units for each answer.
Report all numbers to two significant figures.
n class, Adam did a demonstration in which he shot an arrow ofmass
m 330 gm horizontally into a block
of
mass M 5.00 kg, which was suspended a
distance L
=
75 cm below a pivot point P The arrow was embedded in the block
m
=- M
and the system swung upwards such that the maximum horizontal displacement
was observed
to
be
15
cm. Treat the arrow as a point mass.
(a)
[7 pIS ]
Calculate the maximum kinetic energy of the system consisting
of
the arrow embedded in the block.
(b) [7 pIS }
Calculate
the
velocity
ofthe
arrow immediately before it struck the block.
(c)
[6 pis ]
Calculate
the
angular momentum
of
the arrow relative to the axis
of
rotation immediately before impac
Will this be the same as the angular momentum
of
the system immediately after impact? Explain.
\