This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: P5.11 (a) See Figure to the right. T mz—r.
(b) 68.0—T—m2g=mza (Block#2} Lymlgzmla (Block #1) 1’“ i i T": s
MI —I» T1— 171: —'f . ‘—
Adding, 1 = #1:": I 2 = {59:52 I sac—m +msg=Im1+sza “=11” “28:1?“ :1 : ﬁﬂug :— FIG. P5.11
1 Z P513 (Case I, impending upward motion) ﬂ.
Setting Pegs 50° : ‘—
i=5’A
2P3 =0: Pc0550.0°—n:0 ; I $1;me
fa m = ﬂan: f8,“ = #3139055000 _5 mg‘
= U.250{0.643)P = 0.161P 1’ ' P‘sIIn 50°
Setting 1 f5, max = JIL 1'!
I ii
2 Fy : 0: P sin 50.00—0.161P— 3.00900) : 0 pm 50» I—
Eb
Pm = 48.6 N :/
(Case 2, impending downward motion) P l _ _ __ Mg
As in Case 1, Pam 50°
fa. m = “161? FIG. P5.13
Setting
Z I; = 0: P sin 50.U°+U.161P— 3.00[9.00) : 0
Pmin : 31.7 N
P519 TcosBﬂU": mg: [00.0 kg)[9.00 mfg!) I


(a) T = 787 N: T = (68.6 N)i + (734 N)j F: :* 500”

(b) Tsin5.0°: mac: .0: : 0.85? mills2 toward the center of _ _ _ 51
the circle.
ME The length of the wire is urmecessary information. We
could, on the other hand, use :it to find the radius of the circle, the speed of the 13013, and the period of the motion. FIG. P5.19 P539 P550 (a) The crate is in equilibrium, just before it starts to move. Let the normal
force acting on it be :2 and the friction force, f8. Resolving vertically: n : F: + Paine. Horizontally: Pcosn? : f8. But, f5 31 pan i.e.,
PEOSQEpJFx. +Psint9) or P{cosQ—,us sinug) ﬁlial"g. Divide by cosé':
Pﬂ —p.s tan9)gpsl:z secE'. Then HP _. = graFrsecs' .
m 1 — its tan 6'
0.400 100 N secsJ
(b) P:#
1 — 0.400 tans?
9(deg)  0.00 15.0 30.0 45.0 60.0
P(N)  40.0 46.4 60.1 94.3 2.60
It the angle were 68.2D or more, the expression for P would go to inﬁnity and motion would
become impossible.
(it) Since the object of mass m2 isinequilibrium, 21:3: =T—ng=0 or T= (b) The tension in the string provides the required centripetal acceleration of the puck.
Thus, FC=T= mag .
m '02.
(c) From F: = 1
R
we have 1): RF” 2 ﬂJSR
m1 m1 P555 (21) HIT f—ngU
ZJER
f—F‘s” 3?
T: 431313;!!!
3 (b) T: 2545 FIG. P5.55 ...
View
Full Document
 Summer '07
 MahaAshourAbdalla
 Physics

Click to edit the document details