A photovoltaic cell ________
A) makes electricity by having electrons flow from a negative to a positive layer
B) is most efficiently used at high latitudes
C) cannot be used without being tied to a power grid
D) has iron making up the greatest percentage of its weight
E) comes with a high price because of the high price of its fuel
Answer: C
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A wagon is being pulled with a constant force while its mass decreases. Acceleration of the wagon
A. will be zero. B. remains the same. C. increases. D. decreases.
The impulse-momentum relationship Ft = change in mv, applies to a fast-moving baseball hitting a bat with a force F. Then m in the equation is the
A. mass of the ball. B. mass of the bat. C. momentum of the ball. D. none of the above
The rate of natural increase can be zero, as in ____________, where both the birth and death rate are 9 per 1,000.
A) australia B) germany C) austria D) switzerland E) the United States
Laminar flow, where water moves in approximately straight-line paths, characterizes ________
A) slow-moving streams B) the bottoms of channels C) fast-moving streams D) the edges of channels E) all of the above