PHY 121 prelab rotational motion.pdf

PHY 121 prelab rotational motion.pdf - Prelab Rotational...

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Unformatted text preview: Prelab: Rotational motion ,1. . _ . . I Name: 2 l’iCJi'Tf‘if'J 3‘ ill”. -.‘_l "U“ 3 Section dayltime W‘O‘PAUV $-OQ I‘H‘ri. Consider the apparatus as used in this lab: A cube of mass M = 500 g and side length 30 mm is free to spin on an axis through the center of one face. A massless pulley on this axis has a ‘ diameter of 2r = 10 mm. An object with m = 50 g is hung from a string wrapped around the pulley. The assembly is released from rest. Ignore friction. 1. (2 points) What is the time to unwind L = 30 cm of string. Hint: Find the angular acceleration of the apparatus, then find the time using A6 = 1 At2 Where A6 = L/r. Inamanr or ‘Ifiufia 61': r" 2 %) T1 ié'mt'h mjzmraw (WW 0‘=.____._——-——————--_('°5)(0\' )( 1 ’\ ——’ - '03 mfg“: ch-osof-H‘r ‘1‘ (’OS')(5\[03>4 ('5 J 1—. La< 0( .. W3 6‘5 ‘0 r73: Lof mr—i—‘F X: 32l3mJ~/3 T’- [:r’d 0“ "‘6 Q: % 61gb” MN ”MW mw firm“ — ,3 +1 29 gma W. r ’ ’7?“ " ‘5? mgv-rmma 0‘ _ m3 5'“? .. iD/ ~ ’ 1 1 VNA +2 26 m9 <T]—YYW\ mr—I er 8 60 J7: 2. (2 points) What is the kinetic energy of the spinning block after the string unwinds? Use energy methods. f: gM(—i) 0‘74 ‘_%.7§.r0'.7 44E ' ZZW .. ‘ID L ’ " FL- » \ \\ I i 214"" (-33%) W" 1 MC: iz(1.87940g)<’Z‘-‘Z“""‘“"‘JJ : |[email protected] [0—6Kq mm a: (\Z$\N\‘)S _ ,L {-1 ’W 7- 1-“ L' 2q - L‘é - 2L. T’ (z 7k“? Wm: Mgr T— f- 103‘) : F‘flj— 13‘ '6 is V' :.%‘is "I .. IQ 5 ~— - 9.: r bd- \L €00? “v Ms— 7—:qu 1’; mos: MR 3. (3 points) Use equations 1, 3, and 4 to derive equation 5. W’CJ'O/C \ T? m {Gym} meiom ”Am—Lg VMR, \/, g0 tomb“ act-hag OW FV‘H‘V ('4 {=14 f=rT szrT 4. (3 points) Derive equation 7. WOW? 0*" Ihzj’h'm I‘f EA“:— W634“) a @‘J Ah ...
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