Figure 17-32 shows the output from a pressure monitor mounted at a point along the path taken by a sound wave of a single frequency traveling at 343 m/s through air with a uniform density of 1.21 kg/m 3 . The vertical axis scale is set by ▵ p s = 4.0 mPa. If the displacement function of the wave is s(x, t ) = s m cos (kx − ωt), what are (a) s m , (b) k , and (c) ω ? The air is then cooled so that its density is 1.35 kg/m 3 and the speed of a sound wave through it is 320 m/s. The sound source again emits the sound wave at the same frequency and same pressure amplitude. What now are (d) s m , (e) k , and (f) ω ? Figure 17-32 Problem 14.
Figure 17-32 shows the output from a pressure monitor mounted at a point along the path taken by a sound wave of a single frequency traveling at 343 m/s through air with a uniform density of 1.21 kg/m 3 . The vertical axis scale is set by ▵ p s = 4.0 mPa. If the displacement function of the wave is s(x, t ) = s m cos (kx − ωt), what are (a) s m , (b) k , and (c) ω ? The air is then cooled so that its density is 1.35 kg/m 3 and the speed of a sound wave through it is 320 m/s. The sound source again emits the sound wave at the same frequency and same pressure amplitude. What now are (d) s m , (e) k , and (f) ω ? Figure 17-32 Problem 14.
Figure 17-32 shows the output from a pressure monitor mounted at a point along the path taken by a sound wave of a single frequency traveling at 343 m/s through air with a uniform density of 1.21 kg/m3. The vertical axis scale is set by ▵ps = 4.0 mPa. If the displacement function of the wave is s(x, t) = sm cos(kx − ωt), what are (a) sm, (b) k, and (c) ω? The air is then cooled so that its density is 1.35 kg/m3 and the speed of a sound wave through it is 320 m/s. The sound source again emits the sound wave at the same frequency and same pressure amplitude. What now are (d) sm, (e) k, and (f) ω?
The figure gives the acceleration a versus time t for a particle moving along an x axis. The a-axis scale is set by as = 12.0 m/s². At t = -2.0
s, the particle's velocity is 11.0 m/s. What is its velocity at t = 6.0 s?
a (m/s²)
as
-2
0
2
t(s)
4
Two solid cylindrical rods AB and BC are welded together at B and loaded as shown. Knowing that the average normal stress must not
exceed 150 MPa in either rod, determine the smallest allowable values of the diameters d₁ and d2. Take P= 85 kN.
P
125 kN
B
125 kN
C
0.9 m
1.2 m
The smallest allowable value of the diameter d₁ is
The smallest allowable value of the diameter d₂ is
mm.
mm.
Westros, from Game of Thrones, has an area of approximately 6.73⋅106 miles26.73⋅106miles2. Convert the area of Westros to km2 where 1.00 mile = 1.609 km.
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