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1)
diketahui :
R = 5 m
v = 15 m/s
ditanyakan :
as =?
jawab :
as = v²/R
as = 15² /5
as = 225/5
as = 45 m/s²
Gambar 2
1)
diketahui
ωo = 3 put/s =3x2π rad/s = 6π rad/s
ωt = 0
t = 18 s
ditanyakan :
a) α = ?
b) Θ =?
c) vt saat 9s
jawab :
ωt = ωo + α t
0 = 3 + 18 α
-18 α = 3
α = - 1/6 put/s²
b)
θ = ωo t + 1/2 α t²
θ = 3 x 18 - 1/2 1/6 18²
θ = 54 - 27
θ = 27 put
c)
ωt = ωο + αt
ωt = 3 - 1/6 (9)
ωt = 3 - 1,5
ωt = 1,5 put/s
v = ω R
v = 1,5 x 2π R
v = 3πR m/s
diketahui : r = 5 m
V = 15 m/s
ditanya : as (percepatan sentripetal)
as =
=
= 225/5 m/s²
= 45 m/²
gambar 2 no.1
diketahui : ωo = 3 put/s
ωt = 0 (berhenti)
t = 18 s
ditanya : α , θ , V (t = 9s)
a) ωt = ωo - α .t
0 = 3 - α . 18
18.α = 3
α = 3/18
α = 1/6 put/s²
b) θ = ωo . t - 1/2 α . t² (dalam putaran)
= 3 . 18 - 1/2 . 1/6 . 18²
= 54 - 27
= 27 putaran
c) ωt = ωo - α .t
= 3 - 1/6 . 9
= 3 - 3/2
= 3/2 put/s
V = ω . r
= 3/2 π . put/ 2π
= 3/4 put/s
karena r tak diketahui ,maka V linier menggunakan put/s