A typical battery (e.g., D-cell or AA-cell) supplies electricity at an approximate cost of
A) $1./kW ? h.
B) 10.¢/kW ? h.
C) $10./kW ? h.
D) 1.¢/kW ? h.
E) $100./kW ? h.
E
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When an ideal gas is compressed isothermally:
A. the internal energy of the gas does not change. B. the work done on the gas is zero. C. heat flows into the gas. D. the temperature of the gas increases.
What do we mean by the "fossil record"?
A) rocks from earlier periods of the Earth's history B) samples of meteorites that fell to Earth early in its history C) remains of ancient organisms preserved in rocks D) an album by the Rolling Stones
A useful method of expressing very small or very large numbers is
A) scientific notation. B) arabic numerals. C) roman numerals. D) significant figures. E) greek letters.
A student pulls a box of books on a smooth horizontal floor with a force of 100 N in a direction of 37.0° above the horizontal. The mass of the box and the books is 40.0 kg
(a) Draw the free-body diagram for the box. (b) Calculate the acceleration of the box. (c) Calculate the normal force acting on the box.