Whether a hydrogen-based energy system is environmentally cleaner than a fossil fuel system depends on ________
A) the source of energy used to produce the hydrogen
B) the car driven
C) governmental incentives for research
D) the amount of fossil fuels that are invested in long-term storage
E) the source of oxygen used for the process
Answer: A
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According to the impulse-momentum equation Ft = change in (mv), a bungee jumper in fall has momentum which is reduced by the force F exerted by the bungee cord. If m is the mass of the jumper, then v in the equation is the speed of the
A) jumper. B) cord. C) both A and B D) none of the above
The former Netherlands colonies of Aruba, Bonaire and Curacao lie off the northern coast of _________________.
Fill in the blank(s) with the appropriate word(s).
What soil-forming factor influences the chemical, textural, and structural character of soil?
A. geologic B. climate C. topographic D. biological E. time
A 2-kg mass weighs 20 N and is suspended 2 m above the ground. Its potential energy relative to the ground is
A. 30 J. B. 40 J. C. 10 J. D. 4 J.