The operation of a bimetallic strip relates to differences in
A. expansions of metals.
B. heat capacities of metals.
C. conductivities of metals.
D. indeterminate
Answer: A
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A ball is tossed straight upward at 40 m/s with no air resistance. One second before it reaches the top of its path its speed is
A. zero. B. 10 m/s. C. 20 m/s. D. 30 m/s
The reason the Sun's radiant energy is of shorter wavelengths than the Earth's is because the Sun
A) has much more thermal energy. B) has a higher temperature than the Earth. C) is an energy source while the earth is primarily an energy receiver. D) all of the above E) none of the above
Why are large areas of North America covered with immature soils characterized by weakly developed horizons?
What will be an ideal response?
How many phosphate groups are part of a nucleotide?
A) only 1 B) only 2 C) only 3 D) 1, 2 or 3