The critical speed of a trommel (N) is related to its dia D. as _____________________?
A. N ∝ 1/√D
B. N ∝ √D
C. N ∝ D
D. N ∝ 1/D
A. N ∝ 1/√D
B. N ∝ √D
C. N ∝ D
D. N ∝ 1/D