Question

MENARIO #3 A brick of mass m is hanging from a ribbon of negligible mass that is wrapped around a disk with a meter of 1m. The disk is free to rotate without friction around a central axis. 27) (SCENARIO #3) When released from rest the brick takes 1.2 seconds to fall a distance of 2m. During this time the net force on the brick is 20N downwards. What is the mass of the brick? 28) (SCENARIO #3) What is the tension in the ribbon? 29) (SCENARIO #3) What is the moment of inertia of the disk? 30) (SCENARIO #3) While it is being accelerated by the falling brick, what angle, in degrees does the disk rotate through?

Answer 1

By motion and each s=utt at² 200+ _x 9X 1.22 a=2.78 m/s mg = mg-T= 20 9.&bs=' - m= 7.2 kg m= 7.2 kg O Ta m (9-a) = 7.2( 9.8-2.78) T= 50.56N To T.R= I. alk I = T. R² = 4.55 kgm? 9 & o=watt 1 at ²-a 0=229.37 rad