The ozone layer absorbs __________ radiation from sunlight
Fill in the blank(s) with correct word
ultraviolet
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Determine the equivalent capacitance of the combination shown when C = 15 mF
a.
20 mF
b.
16 mF
c.
12 mF
d.
24 mF
e.
75 mF
Calculate the radius that a loop should have so that the magnetic energy density at its center is equal to 6 mJ/ m3 when a current I = 20A passes through the loop?
A) 26 cm B) 10 cm C) 7 cm D) 18 cm E) 15 cm
In a metal alloy manufacturing and heat treatment plant and in its immersion quenching process, steel plates are first heated in a furnace and then quenched (or cooled) in a coolant bath to obtain the desired steel properties and surface hardness. In one such process a flat stainless steel plate 0.6-cm-thick, 7.5-cm-wide and 0.3-m-long is immersed horizontally at an initial temperature of 980°C in a large water bath at 100°C and at atmospheric pressure. Determine how long it will take this plate to cool to 540°C.
GIVEN
? A flat stainless steel plate is immersed horizontally in water
? Plate thickness (s) = 0.6 cm = 0.006 m
? Plate width (w) = 7.5 cm = 0.075 m
? Plate length (L) = 0.3 m
? Initial plate temperature (Tpi) = 980°C = 1253 K
? Pressure = 1 atm
? Water bath temperature (Tb) = 100°C (saturation) = 373 K
FIND
? Time for plate to cool to Tpf = 540°C = 813 K
ASSUMPTIONS
? The heat fluxes from the bottom and top of the plate are equal
? The plate is polished
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for water at the pool temperature of 100°C
From Appendix 2, Table 35, for steam at 100°C
From Table 9.2, The surface tension, o, for water @ 100°C = 0.0589 N/m
From Table 9.1, The coefficient, Csf, for water on mechanically polished stainless steel = 0.0132
From Table 11.3, the emissivity of polished stainless steel at the average temperature of
(980°C + 540°C)/2 = 760°C (g) = 0.22
A light beam enters water at an angle of incidence of 37°. Determine the angle of refraction
What will be an ideal response?