The formation of our _______________ occurred about 4.6 billion years ago
Fill in the blank(s) with correct word
Solar System
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Reconsider the heat exchanger and explore the effect of tube center-to- center spacing in the equilateral array of the finned tubes. Consider the tube spacing of 8.75 cm and 10 cm. What is the extent of change in the average heat transfer coefficient and pressure drop? Likewise, what is the extent of change in the thermal and hydrodynamic performance if a square pitch (inline arrangement is considered) with tube center-to-center spacing of 7.5 cm?
GIVEN
Heated air flowing over an equilateral staggered tube bank
Exhaust gas temperature
Tair,in = 400°C
Number of tube rows (NL) = 10
Tube diameter (D) = 2.5 cm= 0.025 m
Center to center pitch(S) = 7.5 cm=0.075 m
Free stream velocity (Ua) = 2 m/s
Tube surface temperature (Tt) = 175°C
Finned surface extension ration (?)= 1.15
FIND
The average heat transfer coefficient (c h) and pressure drop in gas flow stream.
ASSUMPTIONS
Steady state
Tube wall temperature is uniform and constant
SKETCH
Suppose that a planet was discovered that has twice the mass and twice the diameter of Earth. What would be the escape velocity for this planet? (Assume that for Earth the escape velocity is 11 km/s.)
A. 15.6 km/s B. 11 km/s C. 22 km/s D. 7.8 km/s
The spectral lines of white dwarf stars are redshifted, because their high gravity reduces the energy carried by light escaping from the white dwarf.
Answer the following statement true (T) or false (F)
The objective lens of a telescope has a focal length of 2.0 m and its eyepiece has a focal length of 1.0 cm. What is the magnification of this telescope when viewing Jupiter?
A) 0.0050 B) 0.50 C) 2.0 D) 20 E) 200