A heat engine produces 300 W of mechanical power while discarding 1200 W into the environment (its cold reservoir). What is this engine’s efficiency?
A. 0.20
B. 0.25
C. 0.33
D. Other (specify)
A. 0.20
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As material flows into a black hole as viewed from well outside the event horizon
a. the material will experience time dilation. b. the material will become hotter. c. the material will produce an absorption spectrum. d. the material will appear to us to fall into the black hole very rapidly. e. the material will experience time dilation and the material will become hotter.
When at home during a tornado warning, you should seek shelter in ______________ of the building
a. the basement or lowest central level b. the attic c. a doorway d. the garage
If the activity of a sample of 232Th decreases from 1000 cpm to 500 cpm in 60 min, in another 60 min its activity will be
a. 500 cpm. b. 0 cpm. c. 250 cpm. d. 125 cpm.
A river's suspended load and bed load may accumulate at its mouth and form a
a. sea arch. b. guyot. c. delta. d. sea mount.