The secant case means that a cylindrical projection has ________ line(s) of tangency:
A. 3
B. 2
C. 1
Answer: B
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A sandbag in outer space moves at 3 m/s and collides and sticks to a half-as-massive sandbag initially at rest. Compared with the kinetic energy of the moving bag before collision, the kinetic energy of the coupled bags after collision is
A) one-third. B) two-thirds. C) three-quarters. D) not enough information given
Animals that can live for extended periods on land, but must return to water-based environments to reproduce are
____. a. hominids b. plankton c. reptiles d. mammals e. amphibians
Characteristics of estuaries include all of the following except: a. an abundance of nutrients
b. extreme temperature ranges. c. a variation of salinity from fresh to salt water. d. low biological productivity.
Prominences and solar flares present dangers to astronauts primarily because ________
A) they can overheat the spacecraft. B) they do not pose a danger to astronauts. C) they disrupt communications on earth D) they pose a radiation danger from X-rays and gamma rays, but primarily from high-energy particle emissions.