1.A jar test has shown that the optimum dose of ferric chlorideconsumes all of the alkalinity. If the amount of the ferricchloride that is in excess is 10 mg/l, how much lime(Ca(OH)2) in mg/l must be added to neutralize the acid formed.
2.The uniform rod AB of weight W is released from rest when B=70. Assuming that the friction force between end A and the surface is large enough to prevent sliding, determine immediately after release
(a) the angular acceleration of the rod,
(b) the normal reaction at A,
(c) the friction force at A