One can increase the insolation upon a one ft2 horizontal plate by ________
a. using a fresnel lens of one ft2
b. using two 1 ft2 fresnel lenses, one on top of the other
c. adding reflectors around the plate
d. increasing the temperature of the plate
e. increasing the absorption of the plate
c
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Nuclear Reactions: Determine the missing product X in the following nuclear reaction: 
B + neutron ? X + alpha particle
Fill in the blank(s) with the appropriate word(s).
Which of the following describes a major danger of interstellar travel at near-light speed?
A) Atoms and ions in interstellar space will hit a fast-moving spacecraft like a flood of dangerous cosmic rays. B) Any interstellar journey will take much longer than the lives of the crew members. C) Time dilation will slow the heart beats of the crew to a dangerously low rate. D) Asteroid fields floating in interstellar space will present a navigational challenge.
A(n) ________ represents a relatively peaceful mass loss as a red giant becomes a white dwarf
A) nova B) planetary nebula C) supernova D) emission nebula E) supernova remnant
Your largest personal contribution to global warming in a year comes from ________
a. use of freon propellants b. use of air conditioners in your home c. driving your car d. cutting down trees e. burning natural gas for home heating.