Voting_Question_Solutions_Jan11

Voting_Question_Solutions_Jan11 - Consider the situation...

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Unformatted text preview: Consider the situation shown at left below. A puck of mass m, moving at speed v hits an identical puck which is fastened to a pole using a string of length r. After the collision, the puck attached to the string revolves around the pole. Suppose we now lengthen the string by a factor 2, as shown on the right, and repeat the experiment. Compared to the angular speed in the first situation, the new angular speed is mm- “”4“"- v= M? min as“ {fluid- up r 2r 19:14. In firs-'1 '—@ '——@ muss-m SI: £5 5 914-va?th '3.- 51 “lud‘l‘lm 9., 1. twice as high @ half as much 2. the same 4. none of the above Sakai-1w- o. + 29: amok {rived—‘1 gar. Lag app-i effteak firm. , So (1, :Fg. I asst-m. ‘2‘“! ‘Jl‘lflmutga: (ML Wm‘l' 4:: mm. to, WW was. ”'L'fl't F3 “(LEE-Li 1%“: r ftififllfiif Emir-1,1 F - F- : 1%? fl 1 7-”ij u, .. {1 ram (mil-t F farhlflfi (CNS-f; 1'. $1,!” =- 1, g" bwfi' W :mth% h“ . ; JFLFIH Fir-:6'I‘irl-1j'h—I‘: ' m;- Hflzrfai Two wheels with fixed hubs, each having a mass of 1 kg, start from rest, and forces are applied as shown. Assume the hubs and spokes are rnassless, so that the rotational in— ertia is I = mRZ. In order to impart identical angular accelerations, how large must F2 be? ...
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