A product of incomplete combustion that is a major air pollutant is
a. H2O.
b. O2.
c. NOx.
d. CO.
d
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The rotation curve of a galaxy can be used to determine
a. the relative number of hot young stars in the galaxy. b. the relative amount of gas and dust in the galaxy. c. the radius of the galaxy. d. the luminosity of the galaxy. e. the mass of the galaxy.
Specific Heat: A person consumes a snack containing 14 food calories (14 kcal). What is the power this food produces if it is to be "burned off" due to exercise in 6 hours? (1 cal = 4.186 J)
A. 2.7 W B. 9763 W C. 0.6 W D. 0.0027 W
Betelgeuse is a red supergiant star in the constellation Orion. It radiates heat at the rate of 2.70 × 1030 W and has a surface temperature of 3000 K. Assuming that it is a perfect emitter, what is the radius of Betelgeuse?
The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 · K4. A) 7.80 × 1010 m B) 8.70 × 1010 m C) 1.40 × 1011 m D) 1.90 × 1011 m E) 2.16 × 1011 m
The block shown is pulled across the horizontal surface at a constant speed by the force shown. If M = 5.0 kg, F = 14 N and ? = 35°, what is the coefficient of kinetic friction between the block and the horizontal surface?
a.
0.44
b.
0.33
c.
0.38
d.
0.28
e.
0.17