Question

Sebuah benda berputar dengan kelajuan 20 put/s. apabila jari jari lintasan sebesar 50 cm, percepatan sentripetal yg dialami benda sebesar ... (tolong sertakan dengan cara ya trmksh)

A. 80π² m/s
B. 160π² m/s
C. 200π m/s
D. 200π² m/s
E. 260π² m/s

Answer 1

F = 20 Hz
w = 2π f = 40π rad/s

percepatan sentripetal
as = w² R
as = (40π)² • ½
as = 800π² m/s² ← jwb

Answer 2

V = ω R
ω = 20 put/s = 20 . 2π = 40 π rad/s
R = 50 cm = 0,5 m

v = 40 π . 0,5 = 20π m/s

as = Fs / m
as = (m v² / R) . 1/m
as = v² / R
as = (20 π)² / 0,5
as = 400 π² / (1/2)
as = 400 π² . 2 = 800 π² m/s²

percepatan sentripetal yg dialami benda sebesar 800 π² m/s²