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Quiz3_solutions

# Quiz3_solutions - Physics 2 Summer Session 2008 Quiz 3...

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Physics 2 – Summer Session 2008 Quiz # 3 Solutions Question 1 The path of each planet about the sun is an ellipse with the sun at (a) the center (b) one focus (c) centered between the two foci (d) on the apex Correct answer is (b) Question 2 In the Simple Harmonic Equation x = 5 cos(10t+ π /6), the amplitude is (a) 5 (b) 10 (c) 6 (d) 10t + π / 6 (e) π /6 Amplitude = maximum absolute value of the displacement x Æ Correct answer is (a) Question 3 Consider a mass-spring system, where the mass oscillates according to simple harmonic motion: x = A cos( ω t + φ ). At t=0, the mass is at the equilibrium position moving to the left. Determine the phase angle φ . (a) 0 (b) π /2 (c) π (d) 3 π /2 (e) Need more information At t=0, x=A cos φ . Want x(t=0) = 0 Æ φ = π /2 or 3 π/2 v = - ω A sin( ω t + φ ). Want v(t=0)<0; v(t=0) = - ω Asin φ . Æ want sin φ >0 Æ φ cannot = 3 π /2 Æ Correct answer is (b) Question 4 Consider a mass-spring system where the oscillation is described by x = A cos

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Quiz3_solutions - Physics 2 Summer Session 2008 Quiz 3...

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