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A 等比級數
B 等差級數
C 調和級數
D 不成級數 為最多
A 1.1m
B 2.2m
C 3.3m
D 4.4m

P=T×ω

6.6π=90 × D2 × 2π×30060 × 175

D=1.1(m)

A 960,480,240 rpm
B 540,270,180 rpm
C 240,360,480 rpm
D 180,240,300 rpm

n1=60rpm;n2=120rpm;n3=N=240rpm

n2×n4=n32

120×n4 = 2402

n4=480(rpm)

n1×n5 = n32

60×n5 = 2402

n5=960(rpm)