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Unformatted text preview: An object that weighs 755.8 N is puiied an a herizentai surface by a herizontal puff of 50.0 N to the right The fricticm
farce on this Object is 301} N te the Ieﬁ The acceieraticn Ofthe object is closest to:
A) 0.26? mfsl
B) LO? mr‘s2
C} 2.6} mfsl
D} 10.5 mst
LA (M: 545,0 4/ 9m: 3 « 1.65/3.
(E: 567,47 A/
392‘: 36%? A/ Two biocks, A and 5‘, are being potted to the right atong a horizonta} surface by a horizonta} E00 N poi}, as shown in the
ﬁgure. Both of them are moving together at a constant vetocity of 2 .0 nos to the right, and both weigh the some. Which
of the ﬁgures bekow shows a correct freeboo}; (fragrant of the horizonta} forces acting on upper bkock, A? 8 mos pun A) tom B) HMS “XXV C) w more
i A‘ mm D} A Ram 5) l a A . . .
i X g (No harm(mm! forces act on A.)
l : A person who nornialhur weighs 200 pounds is standing on a scale inside an elevator. The elevator is moving upwards with a speed of 3’ mfs, and then begins to slow down at a rate of 5 rue“53. Before the elevator begins to slow down, the
reading of the scale is , and while the elevator is slowing down, the reading of the scale is
A) 290 pounds, mo pounds
B) greater than 200 pounds, lﬁﬁ pounds
C) greater than 200 pounds, 0 pounds
D) less than 208 pounds, lOO pounds
E) none of the above R4;;Z&v;/§f A man pushes against a rigid, immevahie wait. Which of the {chewing is the most accurate statement concerning this
situation? A) The man can never exert a force en the wait which exceeds his weight. B) ifthe man pushes on the wait with a farce ($280 N, we can he sure that the wait is pushing back with a force of exaetty 200 N en him. C.) Since the wait cannet mave, it cannet exert any force on the man. 8} The man cannot he in eqniiihrinrn since he is exerting 3 net three en the wait. E} The frictinn force an the man‘s feet is directed to the iett. A 4.4 kg box is heid at rest by two ropes that forrn 30° angles with the vertical. An exterhai force F acts verticaiiy
downward on the The force exerted by eaeh of the two ropes is denoteo by T. A force diagram, showing the four
forces that act on the box in equilibrium, is shown in the ﬁgure. The force F is adjusted so that the magnitude of force T
is equai to the weight w. The magnitude of force F, for which this occurs, is ciosest to:
A) 32‘ N
B) 33 N m .; %€ (/ E.) 3? N A 15 kg hioek is on a ramp which is inciineé at 20" above the horizontai. it is connected by a string to 3 i9 kg mass
which hangs over the top edge ofthe rump. Assuming that frietianai forces may he negieeted, what is the magnitude of the acceleratiun ofthe i9 kg hicch? (See Figure.) A} 4.9 mfs2
3} 3.8 mfs2
C} 4.2 mis’2
D) 4.5 ins"33 in? ‘ 2‘,
f 6/ ﬂ/(ly'fm‘l7j [442 t > T~ gamma)” :MM W W: *7” : ’47? q I sci/agﬁﬁafﬁ in» 7’"
(My ma) "W. $717 (94573) :M’q ” LU; gi'ﬁ (Pay) a) t
‘J’V’, *mz
a : m m/s ‘ .—
v (ME v mu 5&4 52m) A driver in a $660.0 kg car tmvefing at 39 mfg siams on the brakes and skids to a step. lfthe coefﬁcient of friction between the. tires and the road is 6.80, how Eang witi the skid marks be? h
A) 9? m
B) 78 m /‘ i \ _‘__/,
C) 32} r I” ‘
D} 90 mm ﬂ’l/a ' 0' g0 \C/z 8‘ 4 V _._ J A tetherhaii is on a 2.i in string which makes an angle of 22° with the vertieai as it moves around the poie in a
horizontai plane. if the mass of the bah is i3 kg, what is the haii‘s speed? A) 1.8 mfs B) 1.4 mfs C) L6 mfs D) 2.} mx‘s n AL
C’\2<' /Z Future space stations wiii create an artificiai gravity by rotating. Consider a cyiindricai space station of 690 m diameter
rotating about its axis. Astronauts waik on the inside surface of the space station. What rotation period wilt provide
"normai" gravity?
A} 3? s
B) 53 s
C) 8.4 s
D} 5.9 s The ﬁgure shows two wires tied to a 2.3 kg sphere which revoives in a horizontai eitcie at constant speed. At this
particuiar speed the tension is the same in both wires. What is the tension? A}I6N
B}23N
C)3¥N
D)ISN FVee g0 D/IQg'V'réLL‘V) A chifd does 350 .3 ofwork whiie pulling a box from the ground up to his tree. house with a rope. The tree house is 5.0 m
above the. ground. What is the mass ofthe box? A) "H kg 8) 4.3 kg C) 5.3 kg D) 6.4 kg A 20 g huhet pierces a sand bag 45 cm thick. if the initial buiiet velocity was ’54 refs. and it emerged from the sandbag
with 32 mfs, what is the magnitude ofthe friction force {assuming it to be constant} the builet experienced whiie it
traveled through the bag? m t 20 ‘3 3002/?» C/T 1/564“ I (7, (/5177
new
V0: VL/ 147/5 U: Via/5 D) 0.99N
#o’ ‘ r I I
$4 0/56 2 k’émjma 79¢ C7915» 7Z/IUL7 7Z0 7L
0? (no /€m 79 km We? W+2<M q g 8\
\/ (/0 \ ?C", l/\ A ball can be rolled down one of four different ramps, as shown in the figure. The final elevation loss of each of the
ramps is the same. Neglecting friction, for whioh rainp will the speed of the hall he the highest at the bottom? A) The speed of the ball will he the same for all ramps.
B) Ramp C) Ramp Y
D) Ramp Z B \ .
beCU/zSG pk ” is I: 0) 6176;»: W7// (0/75" érw J A herizantai springmass system osciilates on a frietieniess tabie. ifthe ratio oftite mass to the spring constant is
0.02} kg ' mJN, and the maximum speed ofthe mass was measured to be 1?.36 mfs, ﬁnd the maximum extension ofthe spring.
A}2.Sm
B)2.Scm 7
,_ cm W], A ’
7: : (AOZ/ ﬂy“ %/
L/h/MX : hq/S a ...
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This note was uploaded on 01/17/2011 for the course PHYS 6a taught by Professor Stanek during the Fall '07 term at UCSB.
 Fall '07
 STANEK

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