Sound travels faster in air if the air is
A) warm.
B) cold.
C) neither warm nor cold.
A
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In contrast to a generator, a motor is a
A. rotational counterpart to a generator. B. generator in reverse. C. means of harnessing magnetic induction. D. all the above
Coal contains only minute quantities of radioactive materials, yet there is more environmental radiation surrounding a coal-fired power plant than a fission power plant. This indicates that
A. the coal-fired power plant has been contaminated. B. the news media is biased in its coverage. C. the coal-fired power plant contains none of the radiation it releases. D. the coal-fired power plant's radiation shields need to be strengthened.
The most common minerals in a granite are the ________.
A. carbonates B. ferromagnesians C. feldspars D. oxides E. micas
Which of the following occurs when protons pass from the intermembrane space to the matrix?
A) F0 rotates and F1 converts the mechanical energy of rotation to chemical energy by hydrolyzing ATP. B) F0 rotates and F1 converts the mechanical energy of rotation to chemical energy by synthesizing ATP. C) F1 rotates and F0 converts the mechanical energy of rotation to chemical energy by hydrolyzing ATP. D) F1 rotates and F0 converts the mechanical energy of rotation to chemical energy by synthesizing ATP.