7. Friction, Inclines, Systems
Kinetic Friction
3:43 minutes
Problem 6a
Textbook Question
Textbook QuestionSo-called volcanic 'ash' is actually finely pulverized rock blown high into the atmosphere. A typical ash particle is a 50-micrometer-diameter piece of silica with a density of 2400 kg/m^3. (b) How long in hours does it take this ash particle to fall from a height of 5.0 km in still air? Use the properties of 20°C air at sea level.
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