phy131 midterm2 - PHY 131.05 Midterm Exam-2 NAME Thursday...

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PHY 131.05 Midterm Exam-2 NAME:————————————– Thursday, March 1, 2007 Exam duration: 75 minutes Grading: —-Q.1——–Q.2——–Q.3———Q4————Total—- ——————–/36———/20——–/32———–/28——————- Useful formulas: Position, velocity, and acceleration: v = dr dt (1) a = dv dt (2) Acceleration due to gravity: g = 9 . 80 m/s 2 (3) Centripetal acceleration: a = v 2 r (4) Kinematics Equations: v ( t ) = v 0 + at (5) r ( t ) = r 0 + v 0 t + 1 2 at 2 (6) Dynamics Equations: F = ma (7) Work: dW = F.ds (8) Kinetic energy of a particle with mass m: K = 1 2 mv 2 (9) 1
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Work kinetic energy theorem: W = Δ K (10) Gravitational potential energy: U ( y ) = mgy (11) Elastic potential energy: U ( x ) = 1 2 kx 2 (12) Momentum: p = mv (13) Impulse momentum theorem: I = Fdt = Δ p (14) 2
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Figure 1: Figure for Question 1. 1 Force exerted on an object The graph shows the net force exerted on a 0.5 kg-object as it moves from x = 0 to x = 8 . 0 m. The object starts moving from rest.
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