What is the ratio of the speed of sound in air at 0°C to the speed at 100° C?
What will be an ideal response?
0.85
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A jet flies at a speed of Mach 1.3. What is the half-angle of the conical shock wave formed?
A) 36° B) 100° C) 30° D) 50° E) 44°
A box is placed on a table which rests on the floor. The box pushes on the table; the Newton's third law pair to the the box's push on the table is the table's push on the floor
A) True B) False
A bimetallic beam of aluminum (Ea 5 70 GPa) and copper (Ec 5 110 GPa) strips has a width of b 5 25 mm; each strip has a thick-ness t 5 1.5 mm. A bending moment of 1.75 N?m is applied about the z axis. The ratio of the maximum stress in the aluminum to that in the copper is approximately:
(A) 0.6
(B) 0.8
(C) 1.0
(D) 1.5
The focal length of a thin lens is 40 mm and its aperture diameter is 10 mm. What is the f-number of this lens?
A) f/4.0 B) f/2.0 C) f/5.6 D) f/0.30 E) f/0.40