The main application of PEEK is as a(n) _________material for carbon-fiber-reinforced composites in aircraft.
Fill in the blank(s) with the appropriate word(s).
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A neutron star, which generates gamma-ray bursts due to "starquakes" on its surface, is called a(n) _______________
Fill in the blank(s) with correct word
Wave Characteristics: Which one of the following lists gives the correct order of the electromagnetic waves from longer wavelength to shorter wavelength?
A. radio waves, infrared, microwaves, ultraviolet, visible, x-rays, gamma rays B. radio waves, ultraviolet, x-rays, microwaves, infrared, visible, gamma rays C. radio waves, microwaves, visible, x-rays, infrared, ultraviolet, gamma rays D. radio waves, microwaves, infrared, visible, ultraviolet, x-rays, gamma rays E. radio waves, infrared, x-rays, microwaves, ultraviolet, visible, gamma rays
To measure the mass flow rate of a fluid in a laminar flow through a circular pipe, a hot wire type velocity meter is placed in the center of the pipe. Assuming that the measuring station is far from the entrance of the pipe, the velocity distribution is parabolic where Umax is the centerline velocity (r = 0), r is the radial distance from the pipe centerline, D is the pipe diameter.
(a) Derive an expression for the average fluid velocity at the cross-section in terms of
Umax and D.
(b) Obtain an expression for the mass flow rate.
(c) If the fluid is mercury at 30°C, D = 10 cm, and the measured value of Umax is 0.2
cm/s, calculate the mass flow rate from the measurement.
GIVEN
• Fully developed flow of mercury through a circular pipe
• Parabolic velocity distribution: u(r)/Umax = 1 – (2r/D)2
• Mercury temperature (T) = 30°C
• Pipe diameter (D) = 10 cm = 0.1 m
• Measured center velocity (Umax) = 0.2 cm/s = 0.002 m/s
FIND (a) An expression for the average fluid velocity (u )
(b) An expression for the mass flow rate (m )
c) The value of the mass flow rate (m )
SKETCH
Briefly explain why starburst galaxies appear fairly ordinary when they are observed in visible light but extraordinary when they are observed in infrared light
What will be an ideal response?