Work out the flywheel numbers

Exercise and reference answers

Questions

1. Hint

   Torque equals force times radius.

   Unit

   N m

   Answer

   5

   Question

   A 25 N pull acts on the rim of a wheel of radius 0.20 m. Torque about the axle?

2. Unit

   kg m squared

   Answer

   0.4

   Question

   A flywheel of mass 20 kg and radius 0.20 m has moment of inertia M R squared / 2. Find it.

3. Hint

   Torque equals moment of inertia times angular acceleration.

   Unit

   per second squared

   Answer

   12.5

   Question

   A torque of 5.0 N m turns a wheel of moment of inertia 0.4 kg m squared. Angular acceleration?

4. Unit

   joule

   Answer

   50

   Question

   That same 25 N pull unwinds 2 m of cord from the rim. Work done by the pull?

Instructions

Read each prompt, key the number into the pad and submit it.

Explanation