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0.1kg mass is spun on a 1.2m string in a horizontal circle. Tension is 3N. What speed is mass spinning?
0.1kg
3N
0.1kg
F
g
T
F
net
= -
g
T
T
T
x
y
T = mg
y
= 0.1(9.8) = 0.98
T
x
= T - T
y
2
2
= 2.83
F
T
gy
F
= mg = 0.98
gx
F
= 0
*no X component
F
net
= 2.83
2.83 = ma
2.83 = (0.1)
v
2
r
( )
θ
θ = arcsin(T /T) = 19.1
y
19.1
1.2m
r
r = 1.2cos(19.1) = 1.1339
v = (2.83/0.1) * 1.1339
v = 5.66475 m/s