Compared to noise, musical sounds have
A) periodic tones.
B) musical notes.
C) both of these
D) neither of these
Answer: C
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A cylindrical tank is assembled by welding steel sections circumferentially. Tank diameter is 1.5 m, thick- ness is 20 mm, and internal pressure is 2.0 MPa. The maximum shear stress in the heads is approximately:
(A) 19 MPa
(B) 23 MPa
(C) 33 MPa
(D) 35 MPa
A turbine takes in 2 200-K steam and exhausts the steam at a temperature of 200 K. What is the maximum theoretical efficiency of this system?
a. 83% b. 75% c. 91% d. 68% e. 62%
The velocity of sound in sea water is 1.53 × 10^3 m/s. Find the bulk modulus (in N/m2) of sea water if its density is 1.03 × 10^3 kg/m3
a. 2.57 × 10^9 b. 2.19 × 10^9 c. 2.04 × 10^9 d. 2.41 × 10^9 e. 2.82 × 10^9
Estimate the volume of a helium-filled balloon at STP if it is to lift a payload of 450 kg. The density of air is 1.29 kg/m3 and helium has a density of 0.178 kg/m3
a. 2 500 m3 b. 310 m3 c. 410 m3 d. 350 m3 e. 500 m3