05quiz_11 - Physics 9A-C Quiz #5 Name: 4/29/2011 Last 4 ID:

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Unformatted text preview: Physics 9A-C Quiz #5 Name: 4/29/2011 Last 4 ID: Asmallblockwithmass0.120kgisattachedtoacordpassingthroughaholeinafrictionless, horizontalsurfaceasshown.Theblockisoriginallyrevolvingatadistanceof0.40mfromthe holewithaspeedof0.70m/s.Thecordisthenpulledfrombelow,shorteningtheradiusofthe circleinwhichtheblockrevolvesto0.10m.Atthisnewdistance,thespeedoftheblockis observedtobe2.80m/s. a)(3pts)Whatisthetensioninthecordintheinitialsituationwhentheblockhasspeed v =0.70m/s? Summingthehorizontalforcesontheblock,thereisonlythetensionwhichprovidesthe centripetalacceleration: F=F T = m v 1 2 r a) F T = m...
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This note was uploaded on 09/28/2011 for the course PHY 9A taught by Professor Svoboda during the Spring '08 term at UC Davis.

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