An electric fan is turned off, and its angular velocity decreases uniformly from 460 rev/min to...

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Physics

An electric fan is turned off, and its angular velocitydecreases uniformly from 460 rev/min to 210 rev/min in a timeinterval of length 4.15 s . a)Find the angular acceleration inrev/s2. b)Find the number of revolutions made by the motor in thetime interval of length 4.15 s . c)How many more seconds arerequired for the fan to come to rest if the angular accelerationremains constant at the value calculated in part A?
An airplane propeller is 1.83 m in length (from tip to tip) withmass 128 kg and is rotating at 2800 rpm (rev/min) about an axisthrough its center. You can model the propeller as a slenderrod.
a)What is its rotational kinetic energy?
b)Suppose that, due to weight constraints, you had to reduce thepropeller's mass to 75.0% of its original mass, but you stillneeded to keep the same size and kinetic energy. What would itsangular speed have to be, in rpm?

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3.7 Ratings (433 Votes)

Here for the electric fan initial angular speed wi 460 revmin wi 767 revs final angular speed wf 210 revmin wf 35 revs a Using first equation of motion angular See Answer

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