If each dimension of a steel bridge is scaled up ten times, its strength will be multiplied by about
A) ten and its weight by ten also.
B) one hundred, and its weight by one thousand.
C) one thousand, and its weight by one hundred thousand.
D) none of the above
Answer: B
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If the universe had ________, that would resolve Olbers' paradox.
A. more electromagnetic radiation than mass B. sources of new matter, like white holes C. an infinite age D. an edge in space E. more mass than electromagnetic radiation
The asteroid belt is believed to be debris left over from the age of formation of the solar system; the tidal effects of ________ probably prevented formation of a major planet there
Fill in the blank(s) with correct word
Photons are
A. negatively charged B. uncharged, particle-like bundles of energy C. positively charged
A car is moving with a constant acceleration. At t = 5.0 s its velocity is 8.0 m/s and at t = 8.0 s its velocity is 12.0 m/s. What is the distance traveled in that interval of time?
A) 10 m B) 20 m C) 30 m D) 40 m E) 50 m