A falling skydiver of mass 100 kg experiences 500-N air resistance. The acceleration of the skydiver is
A) 0.2 g.
B) 0.3 g.
C) 0.4 g.
D) 0.5 g.
E) more than 0.5 g.
D
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Tsunami from oceanic volcanoes are most likely to be caused by ____
a. ?rising upward suddenly b. ?sinking downward suddenly c. ?creating heat that boils seawater d. ?ejecting large amounts of gas e. ?submarine volcanic explosions
Ozone is produced by
A. The burning of coal B. Combustion of sulphur-containing fuel C. Decaying organic matter D. Photochemical oxidation E. Incomplete burning of fuels
During conditions of high humidity, the effectiveness of perspiration as a cooling mechanism for the human body
A) is reduced because less sweat can evaporate B) is reduced because less condensation occurs C) is enhanced because more sweat can evaporate D) is enhanced because more condensation occurs
What is the basic subunit of elements?
A) atoms B) molecules C) electrons D) neutrons E) protons