Name:
Date:
SantaMonicaCollege
Physics14-H.W.5
1. A 100-glumpof clayhitsa wallat 70 cm/sandsticks.A 1009 rubberballhitsthe
samewall at 60 cm/s and reboundswith a speedof 30 cm/s.Whichobject
experiences
the largerimpulsedeliveredby the wallduringthe collision?
Explain
#,t- lafi<--
Tf^r- b.^l,t exgetie..ces
{6a- co\Lsre,.
--, 6l
€*bU--
irnftl\se
t"{
.Jo"--, i ="F:&-t'
'
i={,$;$
\
)
v' )
-'fr
fi,1o'"-k"^(4 r.-,r.>
. I ="-i;-=;tou* it)
,^u&
=1roos{J-
+c'-"'=
_*_-d
,& I|
\
_
o*=.
a:..lilii
_
:*,'H_1
F
\:gf::J:il,
g:- 3ol' ' /J
2. A 0.12-kgballis movingat 6 m/swhenit is hit by a bat,causingit to reverse
directionand havea speedof 14 m/s.Whatis the changein the magnitude
of the
momentum
of the ball?
G,7= 6mt s
- JtQ - 4) '(o'te$)6tt'r'-
zo.-/s)
6- /s) = o'1" B (AF
h3"l/
s,
\r-l
= -2'9
..iili.
J-hc- rrL@q
O
V
w
AF= f;- F
+I
clang<
L
<---o
fYl
?
"tc-terr ["".
= _ lt ( r b l i
r
n r t bn,,- , t.
--t.u k g m/s .
3 . A cranedropsa 0.30kg steelballontoa steelplate.The ball'sspeedsjust
beforeimpactand afterare 4.5 m/s and4.2 m/s, respectively.lf the ball is in
contactwith the platefor 0.030s, what is the magnitudeof the averageforcethat
tl'S rn /S
the ballexertson the plateduringimpact? rl.r = o. So\ ,F:--
6E =-
4,2 m/s
ab = o.o3 s.
/s)
tq- ul ) = (o.sob) G'r'" m/s-Q'sv''
J- =aP
= [o's](-8 ,1 "n/s ) = - l. 6 l
?d-
h
P. At
-\.
.-.9
F = - t.6t
OtO3S
Good Luck!
I{ m/s
-g:l
N-
Page1
Name:
Date:
SantaMonicaCollege
.Physics14-H.W.5
4. A 75-kgswimmerdiveshorizontallyoff a 500-kgraft. lf the divels speed
immediately
afterleavingthe raftis 4 m/s,whatis thecorresponding
raftspeed?
Y\ 1= Soo |<an
ms = ?S kj
h "E
--t
F
_;
V r=
of t.,t"'.\*n
= { = o. *r.'..r-oh6.
+ -__>
t rnrt; - - o
_
rhg
Vg
hr
r
.---->
= - (-tsE)(v'"ls) s
50o13
<_
- 0.6 rn/S -
5. A moderateforcewill breakan egg. However,an egg droppedon the road
usuallybreaks,whileonedroppedon the grassusuallydoesn'tbreak.Thisis
becauseforthe egg droppedon the grass:
Bqccaar $.s- arl[^st;
a.rrA h.r,coE c. it
h;^{
is
tt,T.---
less .
.--->
r = F . afI
-)
JF
L oL inc-rcq-res
ole-c-eq.J<-s,
6. A 2 500-kgtruckmovingat 10.00m/s strikesa car waitingat a trafficlight,
hookingbumpers.The two continue-tomovetogetherat 7.00 m/s._What
was the
.o
|
o
o
i.,
iE;
=
/s
=o
massof the struckcar?
r---i
^
--!.t
-L-l -rl #l .s '<=
r7r'zJSool$
q],ar
6 t
crt'tsei v
- ?
"L l- 1
ynorDe/rtu.rn .-_-_,
tff-+
->
V-= i.oova/s
1 .o o P4 lx
Good Luck!
Page 2