The most important property of elastomers is the high elastic _________.
Fill in the blank(s) with the appropriate word(s).
strain
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A satellite that is in a circular orbit 230 km above the surface of the planet Zeeman-474 has an orbital period of 89 min. The radius of Zeeman-474 is 6.38 × 106 m. What is the mass of this planet? (G = 6.67 × 10-11 N ? m2/kg2 )
A) 6.0 × 1024 kg B) 5.5 × 1024 kg C) 5.0 × 1024 kg D) 6.5 × 1024 kg
Each of two long straight parallel wires separated by a distance of 16 cm carries a current of 20 A in the same direction. What is the magnitude of the resulting magnetic field at a point that is 10 cm from each wire?
a. 57 ?T b. 80 ?T c. 64 ?T d. 48 ?T e. 40 ?T
Suppose a current-carrying wire has a cross-sectional area that gradually becomes smaller along the wire so that the wire has the shape of a very long, truncated cone. How does the drift speed vary along the wire?
1.It slows down as the cross section becomes smaller. 2.It speeds up as the cross section becomes smaller. 3.It doesn't change. 4.More information is needed.
Saturated methyl chloride at 430 kPa(abs) condenses on a horizontal 10*10 bank of tubes. The 5 cm-OD tubes are equally spaced and are 10 cm apart center-to-center on rows and columns. If the surface temperature of the tubes is maintained at 7°C by pumping water through them, calculate the rate of condensation of methyl chloride in kg/(m s).
GIVEN
? Saturated methyl chloride condensing on a ten-by-ten bank of horizontal tubes
? Pressure = 430 kPa
? Tube outside diameter (D) = 5 cm= 0.05 m
? Tube center-to-center spacing (s) = 10 cm= 0.1 m
? Methyl chloride properties given above
? Tube surface temperature (Ts) = 70C
FIND
? The rate of condensation (
m
/L) in kg/(m s)
ASSUMPTIONS
? Steady state
? Laminar flow condensation
? Interfacial shear is negligible
? Tube surface temperature is uniform and constant
? Vapor density is negligible compared to the liquid density
SKETCH
