A 17-mm-wide grating has rulings of 530 lines per millimeter. White light is incident normally on the grating. What is the longest wavelength that forms an intensity maximum in the fifth order?
A) 377 nm
B) 352 nm
C) 402 nm
D) 427 nm
E) 452 nm
A
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Compare the rate of heat transfer and the pressure drop for an in-line and a staggered arrangement of a tube bank consisting of 300 tubes, 1.8 m long and 2.5 cm OD. The tubes are to be arranged in 15 rows with longitudinal and transverse spacing of 5 cm. The tube surface temperature is 95°C and water at 35°C is flowing at a mass rate of 5400 kg/s over the tubes.
GIVEN
Water flowing over an in-line and a staggered tube bank
Number of tubes (Nt) = 300
Length of tubes (L) = 1.8 m
Tube outside diameter (D) = 2.5 cm= 0.025 m
Number of rows (N) = 15
Normal and parallel spacing = 5 cm=0.05 m
Tube surface temperature (Tt) = 95°C
Water inlet temperature (Tw,in) = 35°C
Mass flow rate of water (m) = 5400 kg/s
FIND
(a) Compare the rate of heat transfer (q) and
(b) The pressure drop ( ?p) for the two configurations
ASSUMPTIONS
Steady state
Tube temperature is uniform
SKETCH
PROPERTIES AND CONSTANTS
for water at the inlet temperature of 35°C
Density (?) = 994.1 kg/m3
Thermal conductivity (k) = 0.624 W/(m K)
Prandtl number (Pr) = 4.8
Specific heat (c) = 4175 J/(kg K)
At the tube temperature of 95°C
Prs = 1.88
Series Resonance: In the figure, which of the phasor diagrams represents a series RLC circuit driven at resonance?
A. 1 B. 2 C. 3 D. 4 E. 5
A campus bird spots a member of an opposing football team in an amusement park. The football player is on a ride where he goes around at angular velocity ? at distance R from the center. The bird flies in a horizontal circle above him. Will a dropping the bird releases while flying directly above the person's head hit him?
A. Yes, because it falls straight down. B. Yes, because it maintains the acceleration of the bird as it falls. C. No, because it falls straight down and will land behind the person. D. Yes, because it maintains the angular velocity of the bird as it falls. E. No, because it maintains the tangential velocity the bird had at the instant it started falling.
Which of the following species is undergoing oxidation?
2 CuBr ? 2Cu + Br2 A) Cu B) CuBr C) Cu+ D) Br- E) Br2