Question

Lagi tdk bisa kerja pusing kepala...
tolong dijawab no.1dan2...

Answer 1

No 1 . 
d =40 cm maka r = d/2 = 20 cm = 0.2m
180 rpm

f = 180 /60 = 3Hz
T = 1/f = 1/3
ω=2πf
  = 2π.3
 = 6π

v=ω.r
  = 6π 0.2
  =1.2π

2. r=16cm =0.16m
  v=2.4 m/s
 

v=ω.r
ω = v/r
   = 2.4 / 0.16
   = 15 rad/s

ω= 2πf
15 = 2π f
15/2π = f