- #1
Loren Booda
- 3,125
- 4
A window shade of mass M, thickness W and length L is driven by a linear spring having tension T (with shade unfurled) and tension 0 (with shade rolled up). The solid cylinder upon which the shade winds has radius R and mass m. What is the time elapsed for the shade to roll up completely when released from its unfurled position? Assume zero friction and gravitational acceleration g.