Small quantities of long-lived radioactive isotopes within the earth, principally _____, give off roughly 30 trillion watts of heat.
A. ?potassium 40 and uranium 235?
B. ?uranium235and uranium 238?
C. ?uranium 238and thorium 232?
D. ?thorium 232 andpotassium 40?
Answer: C
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= ____
A. 4xy2 B. 4xy3 C. 4x2y2 D. 4xy
Determine a suitable rectangular flexible lined channel to resist erosion for a maximum flow of 20 ft3/sec if the channel slope is 2%. Use channel dimensions given in Problem 16-15.
What will be an ideal response?
An automotive repair shop is valued at $475,000. If the tax rate in the community is 25.4 mills based on the assessed valuation, how much is the owner taxed?
Fill in the blank(s) with the appropriate word(s).
The ____ sensor uses the principle that if a current is allowed to flow through thin conducting material that is exposed to a magnetic field, another voltage is produced.
A. Hall-effect B. Hole-effect C. Shell-effect D. Back-effect