A flywheel is rotating at 1000 rpm. If it is brought to rest in 10 seconds, what

Practice Questions

Q1
A flywheel is rotating at 1000 rpm. If it is brought to rest in 10 seconds, what is the average angular deceleration?
  1. 100 rad/s²
  2. 10 rad/s²
  3. 20 rad/s²
  4. 50 rad/s²

Questions & Step-by-Step Solutions

A flywheel is rotating at 1000 rpm. If it is brought to rest in 10 seconds, what is the average angular deceleration?
  • Step 1: Convert the rotation speed from revolutions per minute (rpm) to radians per second (rad/s). Use the formula: rad/s = (rpm * 2π) / 60.
  • Step 2: Substitute 1000 rpm into the formula: (1000 * 2π) / 60 to find the initial angular velocity (ωi) in rad/s.
  • Step 3: Identify the final angular velocity (ωf). Since the flywheel is brought to rest, ωf = 0 rad/s.
  • Step 4: Use the formula for average angular deceleration (α): α = (ωf - ωi) / t, where t is the time taken to stop (10 seconds).
  • Step 5: Substitute the values into the formula: α = (0 - (1000 * 2π) / 60) / 10.
  • Step 6: Calculate the result to find the average angular deceleration.
  • Angular Velocity Conversion – Understanding how to convert revolutions per minute (rpm) to radians per second (rad/s) is essential for solving problems involving angular motion.
  • Angular Deceleration Calculation – Applying the formula for angular deceleration, which is the change in angular velocity over time, is crucial for determining how quickly the flywheel comes to rest.
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