Polarization: For a beam of light, the direction of polarization is defined as
A. the beam's direction of travel.
B. the direction of the electric field's vibration.
C. the direction of the magnetic field's vibration.
D. the direction that is perpendicular to both the electric and magnetic field vectors.
Answer: B
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In chemistry, reduction occurs when a substance
A) accepts electrons B) loses electrons C) rearranges its electrons internally D) breaks into its constituent atoms
A 1.00-kg piece of iron at 655°C is dropped into a calorimeter of negligible heat capacity containing 50.1 g of water at 30°C. What is the final temperature of the system? The specific heat of iron is 448 J/(kg K)
the specific heat of steam is 2010 J/(kg K). and the latent heat of vaporization of water is 22.6 × 105 J/kg. A) 100°C B) 210°C C) 320°C D) 430°C E) 635°C
The international time standard is
a. GMT. b. UTC. c. solar time. d. Zulu.
Two long concentric horizontal aluminum tubes of 0.2 m and 0.25 m diameter are maintained at 300 K and 400 K respectively. The space between the tubes is filled with nitrogen. If the surfaces of the tubes are polished to prevent radiation, estimate the rate of heat transfer for gas pressure of (a) 1 MPa and (b) 10 kPa in the annulus.
? Two concentric horizontal aluminum tubes with nitrogen between them
? Diameters ? Di = 0.2 m
? Do = 0.25 m
? Temperatures ? Ti = 300 K
? To = 400 K
? Surface of tubes is polished
FIND
The rate of heat transfer for
(a) Pressure (pa) = 1 MPa
(b) Pressure (pb) = 10 kPa
ASSUMPTIONS
? Steady state conditions
? Radiative heat transfer is negligible
? Only the density of the nitrogen is affected by the pressure
PROPERTIES AND CONSTANTS
From Appendix 2, Table 33, for Nitrogen at one atmosphere and the mean temperature of 350 K
Correcting the density for Pressure
