The speed of an aircraft is given to be 260 m/s in air. If the speed of sound at that location is 330 m/s, the flight of the air
1 answer:
Answer:
So, Ma < 1 Flow is Subsonic
Explanation:
Mach Number:
Mach Number is the ratio of speed of the object to the speed of the sound. It is used to categorize the speed of the object on the basis of mach number as sonic, supersonic and hyper sonic. (It is a unit less quantity)
Mach < 1 Subsonic
Mach > 1 Supersonic
Ma= Speed of the object/Speed of the sound
So, Ma < 1 Flow is Subsonic
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Answer:
the minimum width is b= 0.1414m = 141mm
Explanation:
]given,
L= 4.25
w₀ = 5.5kN/m,
allowable bending stress = 7MPa
allowable shear stress = 875kPa
h/b = 0.67
b = ?
for a linearly distributed load, with maximum load intensity, w₀ of 5.5kN/m,
the maximum moment, M exerted by the timber is =
given h/b = 0.67, i.e h=0.67b
allowable bending stress = = 7000kPa
7000 = (6*6.37)/ (b *(0.67b)² ) = 38.21/0.449b³
3080b³=38.21
b³ = 38.21/3080 = 0.0124
b = 0.232m
h=0.67b = 0.67* 0.232 = 0.155m
for allowable shear stress = (3V)/(2bh)
875 = (3V)/(2bh) = (3x 7.79)/(2xbx0.67b)
875 = 23.375/1.34b²
1172.5 b²= 23.375
b² =0.0199
b= 0.1414m
h=0.67b = 0.67* 0.1414 = 0.095m
the minimum width is b= 0.1414m = 141mm