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Sound slp

The simulation at the source below  (number 4 on the list of required reading and sources; see the Background Materials for this module) allows you to experiment with many of the variables that produce sound when an object is hit or scratched.  The website contains a good explanation of the variables, which include hardness, base frequency, duration, and pluck time.

A small mailbag is released from a helicopter that is descending steadily at 2.42m/s.

A small mailbag is released from a helicopter that is descending steadily at 2.42m/s.

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