If you are conducting a physics experiment using a small laser, which of these safety concerns should be your top priority?
Answer: Eye protection
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The radius of the moon's orbit is about ____ times larger than the radius of Earth
a. 0.6 b. 6 c. 60 d. 600 e. 6000
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
The energy of a photon equals ______________ multiplied by the frequency
Fill in the blank(s) with correct word
A punster in the utility industry has referred to the burning of coal in the Cool Water plant of Southern California Edison as "immaculate combustion." Explain how serious he could have been by reference to Table 12.4 and Figure 12.17
What will be an ideal response?