Aluminum and _________are added to superalloys to provide corrosion and oxidation resistance.
Fill in the blank(s) with the appropriate word(s).
chromium
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A sports car of mass 1000 kg can accelerate from rest to 72. km/h in 6.6 s. What would the average force of the car's engine be?
What will be an ideal response?
LR Circuits: A simple series circuit contains a 6.0-? resistor, an ideal 15-V DC power supply, and an 18-H inductor. What the time constant of this circuit?
A. 110 s B. 3.0 s C. 0.33 s D. None of the given answers are correct.
The heaviest nuclei of all are formed:
A) in the horizontal branch. B) in dense white dwarfs. C) during nova explosions. D) in the ejection of matter in the planetary nebula. E) in the core collapse that set the stage of type II supernovae.
One of the main reasons the Hubble Space Telescope was built and launched was to measure how fast the universe is expanding. If the expansion turns out to be faster than we thought, our estimate for the age of the universe will be
A) older (more time between now and the Big Bang). B) younger (less time between now and the Big Bang). C) unaffected.