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lecture27a - University of British Columbiamav/Phys157/lecture27.pdf · 2019. 11. 6. · Title:...
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Transcript of lecture27a - University of British Columbiamav/Phys157/lecture27.pdf · 2019. 11. 6. · Title:...
Demo with duck
For the function x(t) = 5 cos(3t + 5), what is the period?
A)3B)1/3C)6πD)2π/3E)5
For the function x(t) = 5 cos(3t + 5), what is the period?
A)3B)1/3C)6πD)2π/3E)5
The graph shows a displacement x(t) = Acos(ωt). Adding a small positive phase x(t) = Acos(ωt + φ) will
A) Shift the graph to the right B) Shift the graph to the leftC) Squish the graph so the peaks are closer togetherD) Stretch the graph so the peaks are further apartE) Both A and C
The graph shows a displacement x(t) = Acos(ωt). Adding a small positive phase x(t) = Acos(ωt + φ) will
A) Shift the graph to the right B) Shift the graph to the leftC) Squish the graph so the peaks are closer togetherD) Stretch the graph so the peaks are further apartE) Both A and C
For the displacement graph shown, what is the phase φ?
A 0 B) π/2 C) π D) - π/2
For the displacement graph shown, what is the phase φ?
A 0 B) π/2 C) π D) - π/2
A mass on a spring is struck with a hammer, giving it an initial downward velocity when it is at its equilibrium position. Which of the following functions could describe the motion of the mass?
A) x(t) = A cos(ω t – π/2)B) x(t) = A cos(ω t)C) x(t) = A cos(ω t + π/2)D) x(t) = A cos(ω t + π)E) None of the above
EXTRA: can you determine A in terms of v0 and ω?
A mass on a spring is struck with a hammer, giving it an initial downward velocity when it is at its equilibrium position. Which of the following functions could describe the motion of the mass?
A) x(t) = A cos(ω t – π/2)B) x(t) = A cos(ω t)C) x(t) = A cos(ω t + π/2)D) x(t) = A cos(ω t + π)E) None of the above
EXTRA: can you determine A in terms of v0 and ω?
For the displacement graph shown, what is the phase φ?
A) -π/8 B) -π/4 C) –π/2 D) π/4 E) π/8
For the displacement graph shown, what is the phase φ?
A) -π/8 B) -π/4 C) –π/2 D) π/4 E) π/8
