# quiz7sol - November7,2007 PHY2053 Quiz7(Chapter7) Name:UFID:

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November 7, 2007 PHY2053  Quiz 7 (Chapter 7) Name:                                   UFID: 1. (5 pts) A wheel starts from rest and reaches an angular speed of 8.00 rad/s in 4.00 s.  Assume the angular acceleration is constant and determine the angle (in radians)  through which the wheel rotates during this period. We calculate the angular acceleration of the wheel: α  = Δ ω /Δt = 8/4 = 2 rad/s² Thus the angular displacement is  = (1/2) θ α Δt² = (1/2) × 2 × 4² = 16 rad 2. (5 pts) A 0.50 kg ball that is tied to the end of a 2.00 m cord is revolved in a  horizontal plane so that its speed is 5.00 m/s. What angle does the cord make with the  vertical? Applying the Newton’s second law, we get X-component: mv²/r = Tsin , Y-component: Tcos -mg = 0  θ θ Substitute r = Lsin  into the first equation and solve both equation for T. θ

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## This note was uploaded on 12/13/2011 for the course PHY 2053 taught by Professor Buchler during the Fall '06 term at University of Florida.

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quiz7sol - November7,2007 PHY2053 Quiz7(Chapter7) Name:UFID:

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