A ceiling fan is rotating at 1.1 rev/s. When turned off,it slows uniformly to a

Question

A ceiling fan is rotating at 1.1 rev/s. When turned off,it slows uniformly to a stop in 2.0 min. A) How many revolutions does the fan make in thistime?   ?=___________ rev. (express answer in two significantfigures) B) Using the result from part A, find the number ofrevolutions the fan must make for its speed to decrease from 1.1rev/s to 0.55 rev/s. (express answer in two significantfigures) A ceiling fan is rotating at 1.1 rev/s. When turned off,it slows uniformly to a stop in 2.0 min. A) How many revolutions does the fan make in thistime?   ?=___________ rev. (express answer in two significantfigures) B) Using the result from part A, find the number ofrevolutions the fan must make for its speed to decrease from 1.1rev/s to 0.55 rev/s. (express answer in two significantfigures)

Explanation / Answer

A ceiling fan is rotating at 1.1 rev/s. When turned off,it slows uniformly to a stop in 2.0 min. A) How many revolutions does the fan make in thistime?   ?=___________ rev. (express answer in two significantfigures)
=0-2*3.14*1.1/120=-0.0575rad/sec2
=0-(2*3.14*1.1)2/2*-0.0575=414.96 radian
revolutions = 414.96/6.28=66.07revolution
B) Using the result from part A, find the number ofrevolutions the fan must make for its speed to decrease from 1.1rev/s to 0.55 rev/s. (express answer in two significantfigures)

=(2*3.14*0.55)2-(2*3.14*1.1)2/2*-0.0575=11.93-47.72/-0.115=311.21rad
revolutions = 49.55

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