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Unformatted text preview: RGTATIUNAL MDTIUN i. A bicycle wheel is mounted on a ﬁxed.ﬁ'tctt'nm'ess axle. A light string is wnund around the Li wheel‘s rim. and a weight is anached to the string at its free end. The diagrams helew depict the
situatitin at three different instants: At t= t... the weight is released from rest. At t = a, the weight is falling and the string is still partially weund amund the wheel. At t = t2. the weight and string have both reached the gteund. I Weight and string
\ Weight released
from rest I=In I=I2 Note: The abete diagrams dn net represent stteheseepic phntegi'aphs ef the wheel. a. What is the direction at the angular velocity 5 at the wheel at each time shnwn‘? If Er = til at
any time. state that explicitly. Explain.
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b. What is th ireetien efthe wheel‘s angular aeeeletatien E at each time shown? If E = I] at
an},r time. state that explicitly. Explain.
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c. Rank the magnitudes el'the centripetal aceele ice at peintd at the three times shewn
fay”. agr. 3&2}. If any at these is zero. state that explicitly. Explain ydut teasnning
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Tatert'm's in Intmducrrtry Physics @Ptentie: Hall. [ne McDermntt. Ehal't'er. dt P.E.G.. U. Wash.  First Edition. 2002 a _,i.
Name E _._5 Mecl't HWnﬁE F Mach Rotational motion
HIM—66 2. A small piece of clay is stuck near the edge of a phonograph turntable. Let 5 represent the \J
angular acceleration of the clay and ER represent the centripetal acceleration of the clay. " a. For each situation described below, describe a possible motion of the turntable. {Some parts
have more than one correct answer.) Explain your reasoning in each case. i. E=ﬂandER:ﬂ ﬂﬂi Wuhan 1'? .J
are {flew :7 wev at" 6“? iii. {Iﬁlﬁﬂﬂdﬂliﬁﬂ éﬁeo ,9 53%0 elﬁo :3: to b. The equation “ E = 3er " is not a correct vector equation. i. Explain how you can tell that the vector equation above 1s not correct Enema ‘ o NFl‘ panf3 Jr}? Ollféehbﬁ 0f QR 14% W
gldleeni climriitm. ii. Is“ a: o Err" a correct senior equation? Explain why or why not. Thtorials in Introductory Physics @Prenﬁce Hall, Inc.
MeDermott. Shaffer, a. P.E.ﬁ.. 1.]. Wash.  First Edition, one: ...
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 Spring '07
 Angerson
 Physics

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