13. The angular speed of a motor wheel is increased from 1200 rpm to 3120 rpm in 16 seconds. (i) is its angular acceleration, assuming the acceleration to be uniform? (11) How many revolutions do the engine make during this time ?
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Answer:
The angular speed of a moton wheel is increased from 1200 rpm to 3120 rpm in 16 seconds.
Explanation:
ANSWER
ω
1
=1200rpm
=
60
1200×2π
=40πrad.s
−1
ω
2
=
60
3120×2π
=10πrad.s
−1
t=16sec
(1) Angular acceleration
a=
16
(ω
2
−ω
1
)
=
16
64π
=4πrad.s
−1
(2) Angle, θ =40π16+
2
1
(4π)×256
=1152rad.
(3) When there is no any external force applied on a system of partials then, momentum of system of particles will be consecrate or you can say that if external force is zero, then momentum of system of particles is initially = Momentum of system of particles is finally.
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