When carbon combines with oxygen, energy is released to the surroundings. Thus this reaction
a. is an acid–base reaction.
b. is endothermic.
c. never reaches equilibrium.
d. is exothermic.
d
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Pulsars:
A) spin very rapidly when they're young. B) are the cause of gamma-ray bursts. C) spin very slowly when they're young, and gradually spin faster as they age. D) generally form from 25 solar mass stars. E) emit radio in all directions.
Planets found in the habitable zone of other stars
A) are all rocky planets, like the terrestrial planets in our solar system. B) are all jovian planets. C) include some Earths and super-Earths. D) include hot Jupiters. E) have been demonstrated to be barren of all life.
Which of the following spectral types is more likely to be a flare star?
A) KIII B) MV C) GV D) I E) BII
At room temperature, a typical person transfers energy to the surroundings at the rate of 62 W
If this energy transfer has to be made up by an equivalent food intake, how many kilocalories (food calories) does this person need to consume every day just to make up this energy? (1 cal = 4.186 J) A) 1000 kcal B) 1100 kcal C) 1300 kcal D) 1500 kcal E) 1600 kcal