When Burl and Paul stand on opposite ends of a sign-painting scaffold, the tensions in the supporting ropes
A) are equal.
B) depend on the relative weights of Burl and Paul.
C) combine to equal zero.
D) are in equilibrium.
Answer: B
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Determine the approximate value for the convective heat transfer coefficient for water boiling in vertical tubes at a superheat temperature of 120ºC by using Equation 10-56. Compare this result to that using Equation 10-6. Assume the water pressure is 500 kPa.
Briefly summarize current knowledge about the term NHP in the equation
Number of Civilizations = NHP × flife × fcivilization × fnow. What will be an ideal response?
Current evidence suggests that some massive jovian planets orbit at close orbital distances to their stars. How do we think these planets ended up on these close orbits?
A) These planets migrated inward after being born on orbits much farther from their stars. B) These planets were able to form close to their stars because their solar nebulas were cold in temperature. C) Despite their large masses, these planets are made of rock and metal and therefore could form in their inner solar systems. D) These planets were captured from other solar systems.
Define "intelligent civilization" according to Drake
What will be an ideal response?