A weigh feeder having four idlers in its weigh-frame indicates a load of 60 kg for the feed material (after all corrections). The idler spacing is 300 mm and the effective belt width is 700 mm. If the material is foundry shakeout sand and the feed rate is to be 150 tones per hour, determine the following:

a. Average height of material on the belt (mm).

b. Volume feed rate (m ³ /s).

c. Velocity of belt (m/s)