A boxer punches a sheet of paper in midair and brings it from rest up to a speed of 40 m/s in 0.05 s. If the mass of the paper is 0.01 kg, the force of impact on the paper is about
A) 0.08 N.
B) 0.8 N.
C) 8.0 N.
D) 80 N.
C
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How does the latent heat of evaporation (and its equivalent, the latent heat of condensation) moderate climate?
a) It retards the formation of ice, keeping the oceans warmer. b) By absorbing energy on evaporation and releasing it on condensation, it keeps water cool when the air is hot and warm when the air is cool. c) The endothermic reaction does not allow salt to build up past a certain concentration. d) The latent heat helps generate winds, which help keep the oceans cool when the air is hot. e) It gives water a higher heat capacity, which allows it to stay cool when the air is warm and warm when the air is cool.
Temperature inversions increase outdoor air pollution because they
A. accelerate photochemical reactions. B. are taller than most smokestacks. C. prevent brown air smog. D. prevent the natural mixing of air. E. accelerate the emission of primary pollutants.
Where did the atoms that make up a newborn baby originate?
A. in the explosions of ancient stars B. in the womb of the baby's mother C. in the Earth, through geological processes D. in the digestion of the food that the mother
Which of the following terms refers to the change of state of water from a liquid to a vapour?
A. condensation B. evaporation C. freezing D. sublimation