K.C.S.E Physics Q & A - MODEL 2009PP1QN19

K.C.S.E Physics Q & A - MODEL 2009PP1QN19

​(a) Define angular velocity 
(b) Three masses are placed on a rotating table at distances 6 cm, 9 cm and 12 cm respectively from the centre of rotation. When the frequency of rotation is varied, it is noted that each mass slides off at a different frequency of rotation of the table. Table 1 shows the frequency at which each mass slides off

(i) State two factors that determine the frequency at which each mass slides off
(ii) Oil is now poured on the table before placing the masses. Explain the effect of this on the frequency at which each mass slides off.
(c) Figure 12 shows a flywheel of radius 14 cm suspended about a horizontal axis through its centre so that it can rotate freely about the axis. A thread is wrapped round the wheel and a mass attached to its loose end so as to hang at a point 1.2c above the ground.
When the mass is released, it accelerates at 0.28 ms^-2. Determine the angular velocity of the wheel just before the mass strikes the ground.

answers