Sand drops from the bottom of a hopper into a horizontally moving belt conveyor. If the conveyor is travelling at 2000 fpm and the sand is fed at the rate of 1500 1b/min, the force necessary to drive the conveyor would be

• A. 258 lb
• B. Zero
• C. Cannot be determined from the given data
• D. 10 kg
• E. 516 lb