Warm-Up Exercise 15

Due 10:00 am, Wed, Feb. 8

Physics 123, Winter Semester, 2012

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Did you carefully complete the reading assignment?
yes no

Suppose you create a pulse by moving the free end of a taut string up and down once with your hand beginning at t=0. The string is attached at its other end to a distance wall. The pulse reaches the wall at time tw. Which of the following, taken by itself, decreases the time interval required for the pulse to reach wall? More than one choice may be correct. Mark all that apply
Moving your hand up and down more quickly but by the same amount
Moving your hand up and down more slowly but by the same amount
Moving your hand the same speed but farther up and down
Moving your hand the same speed but a shorter distance up and down
Using a heavier string of the same length under the same tension
Using a lighter string of the same length under the same tension
Using the same string of the same length but under more tension
Using the same string of the same length but under less tension

Explain how each of the following (keeping everything else the same) would impact the energy transfer rate of a wave on a string:
A) reducing the mass density of the string
B) doubling the wavelength
C) doubling the tension
D) doubling the amplitude

In section 16.6, you read about how the 1-dimensional (linear) wave equation can be derived using concepts from PHSCS 121. This kind of analysis is useful in deriving many of the important equations in physics (you'll see many of them in PHSCS 318 and elsewhere). It's a skill you should foster. Carefully re-read this section.
Yes, I carefully re-read
No, I didn't

Was there anything that you didn't understand in the reading assignment? If so, explain.

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