Chapter 13: Problem 21
A hummingbird's wings vibrate at about \(45 \mathrm{Hz}\). What's the corresponding period?
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Chapter 13: Problem 21
A hummingbird's wings vibrate at about \(45 \mathrm{Hz}\). What's the corresponding period?
These are the key concepts you need to understand to accurately answer the question.
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A pendulum of length \(L\) is mounted in a rocket. Find its period if the rocket is (a) at rest on its launch pad; (b) accelerating upward with acceleration \(a=\frac{1}{2} g ;\) (c) accelerating downward with \(a=\frac{1}{2} g ;\) and \((d)\) in free fall.
The total energy of a mass-spring system is the sum of its kinetic and potential energy: \(E=\frac{1}{2} m v^{2}+\frac{1}{2} k x^{2} .\) Assuming \(E\) remains constant, differentiate both sides of this expression with respect to time and show that Equation 13.3 results. (Hint: Remember that \(v=d x / d t .)\)
An automobile suspension has an effective spring constant of \(26 \mathrm{kN} / \mathrm{m},\) and the car's suspended mass is \(1900 \mathrm{kg} .\) In the absence of damping, with what frequency and period will the car undergo simple harmonic motion?
An object undergoes simple harmonic motion in two mutually perpendicular directions, its position given by \(\vec{r}=A \sin \omega t \hat{\imath}+\) A cos wit. (a) Show that the object remains a fixed distance from the origin (i.e.. that its path is circular), and find that distance. (b) Find an expression for the object's velocity. (c) Show that the speed remains constant, and find its value. (d) Find the angular speed of the object in its circular path.
Write expressions for simple harmonic motion (a) with amplitude \(10 \mathrm{cm},\) frequency \(5.0 \mathrm{Hz},\) and maximum displacement at \(t=0\) and (b) with amplitude \(2.5 \mathrm{cm},\) angular frequency \(5.0 \mathrm{s}^{-1},\) and maximum velocity at \(t=0\)
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