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A car tune-up manual calls for tightening the spark plugs to a torque of 35.0 Nm. To achieve this torque, with what force must you pull on the end of a 24.0-cm-long wrench if you pull (a) at right angles to the wrench shaft and (b) at right 110° to the wrench shaft?(a)146N(b)155NA 25-cm-diameter... 顯示更多 A car tune-up manual calls for tightening the spark plugs to a torque of 35.0 Nm. To achieve this torque, with what force must you pull on the end of a 24.0-cm-long wrench if you pull (a) at right angles to the wrench shaft and (b) at right 110° to the wrench shaft? (a)146N(b)155N A 25-cm-diameter circular saw blade has a mass of 0.85kg, distributed uniformly as in a disk. (a)What is its rotational kinetic energy at 3500rpm? (b)What average power must be applied to bring the blade from rest to 3500rpm in 3.2s? (a)446J(b)139W A wheel turns through 2.0 revolutions while being accelerated from rest at 18rpm/s. (a)What is the final angular speed? (b)How long does it take to turn the 2.0 revolutions? (a)65.7rpm(b)3.65s 更新: 麻煩了~希望有清楚的計算過程~謝謝 更新 2: 麻煩一下：http://tw.knowledge.yahoo.com/question/question?qid=1609010907085&mode=w&from=question&recommend=0 謝謝>"
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1. T=F*R，35N.m=F*0.24，F=145.8N 同上T=F*sin110*R，35N.m=F*SIN110*0.24，F=155.2 N; ------------------------------------------------------------------ 2. I=1/2*M*R^2=1/2*0.85*(0.25/2)^2=6.64*10^-3， E=1/2*I*W^2=1/2*6.64*10^-3*(3500/60*2*PI)=446， E/3.2=446/3.2=139.4; ------------------------------------------------------------------ 3. V^2=V0^2+2aS=0+2*18*60*2=4320 V= 65.7 S=1/2*a*t^2 ，2=1/2*18/60* t^2 ，t=3.65;
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