Civil Engineering MCQAE Level Civil Engineering
A flywheel starts from rest and accelerates uniformly to 300 rpm in 10 seconds. The angular acceleration is:
Engineering MechanicsRotation KinematicsMEDIUM
Choose the correct answer
A
30 rad/s^2
B
pi rad/s^2
C
3.14 rad/s^2
D
30 rpm/s
Correct Answer
B. pi rad/s^2
AI Detailed Explanation & IS Code Reference
Unlock the reasoning, formula path and code-linked notes inside your student dashboard.
omega_f = 300 rpm = 300 x 2pi/60 = 10pi rad/s. omega_i = 0. alpha = (omega_f - omega_i)/t = 10pi/10 = pi rad/s^2 = 3.14 rad/s^2. Kinematic analogies: alpha = domega/dt (vs a = dv/dt); theta = omega_i t + 0.5 alpha t^2 (vs s = v0 t + 0.5 at^2); omega_f^2 = omega_i^2 + 2 alpha theta.
ScoreCardAI links this solution with subject, topic and difficulty signals so your scorecard can identify weak areas after a full mock test.
Concept shortcut
IS/IRC reference
Common trap
Practice more Civil Engineering questions
This MCQ belongs to AE Level Premium Test Series. Full tests include timed attempts, rank comparison and subject-wise analysis.