Q#1 (A) A wheel starts from rest and rotates about its axiswith constant angular
ID: 1672173 • Letter: Q
Question
Q#1 (A) A wheel starts from rest and rotates about its axiswith constant angular acceleration. After 6.8s have elapsed,it has rotated through an angle of 25 radiants. (a) what is theangular acceleration of the wheel?(b)what is the angular velocityof the wheel when the t=6.8seconds?(c)what is the centripetalqacceleration of a point on the wheel at a distance r = 0.45mfrom the axis at t=6.8s? (B) A pneumatic high speed cutter with a 7.50cm diametercuting disc is advertized to have a rotation of between 5000 and18,00 revolution/min.(a) what is the range of angular speed inrad/s?(b)what is the range of linear speed of the edge of the disk?(c) what is the average angular acceleration, if starting fromrest, the cutter comes up to its fastest speed in 2.8s? (C) A car engine idles at 800rpm. with the car in neitral, youdeperss the accelerator after 1.2 seconds, the tachometer indicatesan engine speed of 3400rpm.(a) what are the initial andfinal angular velocities in rad/s?(b)what is the averageangular acceleration during the 1.20s interval?(c) how manyrevolution does the engine make during that 1.20s? Q#1 (A) A wheel starts from rest and rotates about its axiswith constant angular acceleration. After 6.8s have elapsed,it has rotated through an angle of 25 radiants. (a) what is theangular acceleration of the wheel?(b)what is the angular velocityof the wheel when the t=6.8seconds?(c)what is the centripetalqacceleration of a point on the wheel at a distance r = 0.45mfrom the axis at t=6.8s? (B) A pneumatic high speed cutter with a 7.50cm diametercuting disc is advertized to have a rotation of between 5000 and18,00 revolution/min.(a) what is the range of angular speed inrad/s?(b)what is the range of linear speed of the edge of the disk?(c) what is the average angular acceleration, if starting fromrest, the cutter comes up to its fastest speed in 2.8s? (C) A car engine idles at 800rpm. with the car in neitral, youdeperss the accelerator after 1.2 seconds, the tachometer indicatesan engine speed of 3400rpm.(a) what are the initial andfinal angular velocities in rad/s?(b)what is the averageangular acceleration during the 1.20s interval?(c) how manyrevolution does the engine make during that 1.20s?Explanation / Answer
Once again, 3 different questions warrant 3 differentanswers(posts)... (A) i=0 and is constant.... =25 rads, t=6.8 s... a)using the formula:=it+1/2t225=0+1/2*6.82 =1.08rad/s2 b)f=0+1.08*6.8 =7.35rad/s c)v=r =0.45*7.35 =3.31m/s aC=v2/r =3.312/0.45 =24.33 m/s2
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