A fly wheel is accelerated uniformly from rest and rotates through 5 rad in the first second. The angle rotated by the fly wheel in the next second, will be:
- 7.5 rad
- 15 rad
- 20 rad
- 30 rad
The Correct Option is B
Solution and Explanation
\(θ_1 = \frac{1}{2} α(2\times 1-1) = 5 \;rad\)
⇒ \(α = 10\; rad/sec^2\)
So \(θ_2 = \frac{1}{2} \times α(2\times 2-1) = 15 \;rad\)
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Concepts Used:
Acceleration
In the real world, everything is always in motion. Objects move at a variable or a constant speed. When someone steps on the accelerator or applies brakes on a car, the speed of the car increases or decreases and the direction of the car changes. In physics, these changes in velocity or directional magnitude of a moving object are represented by acceleration.
