A physical change can be distinguished from a chemical change because during a physical change- A. the properties of the substan
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A wind turbine is initially spinning at a constant angular speed. As the wind's strength gradually increases, the turbine experiences a constant angular acceleration of 0.100rad/s2. After making 2844 revolutions, its angular speed is 140rad/s
(a) What is the initial angular velocity of the turbine? (b) How much time elapses while the turbine is speeding up?
Answer:
a) 126.59 radians per second
b) 134.1 seconds
Explanation:
We can use the rotational kinematic equations for constant angular acceleration.
a) For a) let’s use:
(1)
with the initial angular velocity,
the final angular velocity,
the angular acceleration and
the revolutions on radians (2844 revolutions = 17869.38 radians). Solving (1) for initial velocity:
b) Knowing those values, we can use now the kinematic equation
with t the time, solving for t: