What is the first step in treating raw sewage?
A) filtration of solids
B) removal of fine particles by settling
C) removal of grit by settling
D) removal of sludge
E) disinfection
Answer: A
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A jet flies at 1.4 times the speed of sound. What is the half-angle of the conical shock wave formed?
A) 46° B) 44° C) 30° D) 36°
An aluminum bar (E 5 70 GPa, ? 5 0.33) of diameter 20 mm is stretched by axial forces P, causing its diameter to decrease by 0.022 mm. The load P is approximately:
(A) 73 kN
(B) 100 kN
(C) 140 kN
(D) 339 kN
Two current loops are coaxial and coplanar. One has radius a and the other has radius 2a. Current 2I in the outer loop is antiparallel to currentIin the inner loop. The magnitude of the magnetic field at the center of the two loops is
A.
B.
.C.
.D.
.E.
.The average adult radiates heat energy at the same rate as
a. a 10-W light bulb. b. a 100-kW light bulb. c. a 100-W light bulb. d. none of these.