The 11.5 kg slender rod pivoted about point O is pressed against a spring at point A, in which the spring (k = 375 kN/m) is compressed by 27 mm, as shown in Figure Q2(b). At this instance, the rod is...

The 11.5 kg slender rod pivoted about point O is pressed against a spring at point A, in which the spring (k = 375 kN/m) is compressed by 27 mm, as shown in Figure Q2(b). At this instance, the rod is at horizontal position and is stationary. If the rod is released from this position,

(i)By using the principle of conservation of energy, explain with

calculations on how changing the mass of the rod would influence the

downward reaction of the pivot when the rod passes through a vertical

position.
(ii) From your working in Q2(b)(i), explain two possible ways to increase

the angular velocity of the rod when the rod passes through a vertical

position.