Why is the food-for-oil tradeoff possible? Explain how availability or lack of availability of energy influences the agricultural system
What will be an ideal response?
When external energy is not available, as in traditional agriculture human labor is
necessary. Farm animals can reduce human labor, but it does not eliminate it. Working
behind a plow is hard work (though not as hard as doing it without the animal).
Machines can do many of these things faster and with less effort required of the farmer. It
becomes very attractive to reduce the hard work that wore out so many of our ancestors and
replace that by machines that are fueled by petroleum-based products. Thus, we plow oil
and raise crops.
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One mole of the carbon-12 isotope contains 6.022 × 10^23 atoms. What volume in m3 would be needed to store one mole of cube-shaped children's blocks 2.00 cm long on each side?
a. 4.8 × 10^18 b. 1.2 × 10^22 c. 6.0 × 10^23 d. 1.2 × 10^24 e. 4.8 × 10^24
Thin Lenses: An object is placed 15 cm to the left of a double-convex lens of focal length 20 cm. Where is the image of this object located?
A. 60 cm to the right of the lens B. 60 cm to the left of the lens C. 8.6 cm to the right of the lens D. 8.6 cm to the left of the lens E. 30 cm to the left of the lens
Due to the dual nature of light and matter, either can act in an experiment as if it is a wave or a particle. In which experiment is the wave aspect exhibited for matter?
a. the Davisson and Germer experiment b. the photoelectric effect c. pair production d. Compton scattering
When fast-moving water molecules collide they tend to
A) rebound without sticking. B) stick. C) both of these D) neither of these