Some food costs may rise in the future as a consequence of the increased use of which food-based fuel?
a. Ethanol
b. Gasoline
c. Oil
d. Coal
a
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If its parallax is 1", then the distance to the star is ________ light-years
Fill in the blank(s) with correct word
Gamma rays are photons with very high energy. How many visible-light photons with a wavelength of 500 nm would you need to equal the energy of a gamma-ray photon with energy
A) 1.0 × 106 B) 1.4 × 108 C) 6.2 × 109 D) 3.9 × 103
In Figure 4.2, the applied force F equals 150 N. The force in link B is closest to:
A) 54 N B) 56 N C) 58 N D) 60 N E) 62 N
What happened to all of the quarks that existed freely during the particle era?
A) They froze out of the soup of particles at the end of the era. B) They combined in groups to make protons, neutrons, and their antiparticles. C) They evaporated. D) They combined in groups to make electrons and neutrinos.