Why are spectra of stars different?
What will be an ideal response?
Spectra of stars differ primarily because of differences in their temperatures. Smaller differences occur because of luminosity differences and even smaller differences occur because of slightly different compositions.
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Astronomers are surprised that the radial-velocity method for detecting planets has not discovered more smaller, Earth-like planets.
Answer the following statement true (T) or false (F)
What mass of oxygen (in grams) is produced when 122.6 g of KCI03(formula mass = 122.6 amu) takes part in this reaction?
A) 32.00 grams B) 48.00 grams C) 96.00 grams D) More information is needed.
A heat exchanger uses a staggered tube arrangement of 1 in diameter tubes and with ST = SD = 3 inches. There are four columns of 10 tubes per column and all of the tube surfaces are at 190ºF. Atmospheric air at 80ºF and 14.5 psia is forced across the tube tank at 5 ft/s. Determine the air temperature downstream from the tube bank and the downstream pressure.
What will be an ideal response?
A 12-kg projectile is launched with an initial vertical speed of 20 m/s. It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?
A. ?0.64 kJ B. ?0.40 kJ C. ?0.52 kJ D. ?0.28 kJ E. ?0.76 kJ