_________is the major alloy element in the highest-strength copper alloys.
Fill in the blank(s) with the appropriate word(s).
Beryllium
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Which of the following characterizes the net force on a particle falling through a fluid at its terminal speed?
a. It is at a maximum. c. It is downwards. b. It is upwards. d. It is zero.
A device that transforms mechanical energy into electrical energy is a
A) generator. B) motor. C) transformer. D) magnet. E) none of the above
Process of Science: Explain the phrase used by Carl Sagan, "Extraordinary claims require extraordinary evidence."
What will be an ideal response?
Light Travel Time: Because of the finite speed of light, we see more distant objects as they were in the past. For example, we see the star Alpha Centauri as it was 4.4 years ago, and the Andromeda Galaxy as it was 2.5 million years ago
Astronomers are often asked how we know that these objects still exist when we look at them in the night sky. How would you try to answer this question?