An artificial satellite in a low orbit circles the earth every 98.0 minutes. What is its angular speed in rad/s?
What will be an ideal response?
0.00107 rad/s
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The horizontal cross section of an industrial chimney is shown in the accompanying sketch. Flue gases maintain the interior surface of the chimney at 300°C and the outside is exposed to ambient temperature of 0°C through a heat transfer coefficient of 5 W/(m2 K). The thermal conductivity of the chimney is k = 0.5 W/(mK). For a grid spacing of 0.2 m, determine the temperature distribution in the chimney and the rate of heat loss from the flue gases per unit length of the chimney.
GIVEN
Chimney with hot flue gases inside, ambient temperature outside
FIND
(a) Temperature distribution in the chimney
(b) Rate of heat loss from the flue gases per unit length
ASSUMPTIONS
Steady state conditions
Neglect radiation heat transfer
SKETCH
How do we know that galaxy clusters contain a lot of mass in the form of hot gas that fills spaces between individual galaxies?
A) We detect this gas with x-ray telescopes. B) We infer its existence by observing its gravitational effects on the galaxy motions. C) The hot gas shows up as bright pink in visible-light photos of galaxy clusters. D) We can observe the frictional effects of the hot gas in slowing the speeds of galaxies in the clusters.
Which model of light is discussed in Chapter 17?
A. Ray model B. Photon model C. Wave model D. Solar model
You look at yourself in a plane mirror. If you move away from the mirror and look at yourself again, you now see
a. more of yourself. b. less of yourself. c. the same amount of yourself. d. a larger image of yourself. e. a smaller image of yourself.