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DiscussionHW8

# DiscussionHW8 - RGTATIUNAL MDTIUN i A bicycle wheel is...

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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 abet-e 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. a, t ”y at: tile '7 is they) a mitigate“) tr» em?) a; Wefwlmiﬂ, (teem dam) 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. ‘l: ("MD-ilk (5‘)") 43¢ 5m Memes I? l W: a; I? / J ~ “9 seats ails???” iii M} t. in» tie-ti“?! 8’) Wt “P” It} TL Il‘ 3 ii] J ) m 5M a? 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 _ ﬁ/ at; E’Clm 3" Gite its?) a._ 1 ._ a: tit-F .59 waviiiml a: at 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‘ pan-f3 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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DiscussionHW8 - RGTATIUNAL MDTIUN i A bicycle wheel is...

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