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ataglance05
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Homework Statement
A 1kg engine rotates at 1 rad/sec about a point on a 3meter wire. The engine produces an acceleration of 1 rad/sec^2 and is fird for 2 minutes.
a) What is the ω at the end of 2 minutes?
b) what's the tension in the wire at the end of 2 min.?
c) how far will the engine travel in meters while it's accelerating?
d) what's the Kinetic Energy of the engine after it shuts down?
Homework Equations
a)ω=radius/Time or ω= θ/Time
B) ?
c) S=rθ
θ= ωi(T)+1/2αT^2
d) KE=1/2(Ι)(angluar acceleration)(T)^2
Ι=1/2mr^2
The Attempt at a Solution
a) ω=radius/Time
ω=3/120= 0.25 rad/sec
b)?
c) ?
d) Ι=1/2mr^2
Ι=1/2(1)(3)^2= 3
KE=1/2(Ι)(angluar acceleration)(T)^2
KE=1/2(3)(1)(120)^2
KE=21600 J
need help with b&c and with corroborating a&d!
thanks!