The technique for producing single crystals of turbine blades is by a modification of
(a) Investment casting
(b) Directional solidification
(c) The Bridgeman-Stockbarger technique
(d) The Czochralski technique
(c) The Bridgeman-Stockbarger technique
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Based on galactic rotation curves and cluster dynamics, we think dark matter:
A) is a minor component of the entire mass of the universe. B) is best detected from the X-rays it produces in the intergalactic medium. C) will have no effect on the fate of the universe. D) comprises over 90% of the entire mass of the universe. E) will doom the universe to collapse, overcoming the redshifts we now observe.
About how many stars has the Hipparcos mission given us accurate distance data on?
A) about 3,000, about half of what you can see with the naked eye alone B) over 6000, the visible naked eye stars and some seen in binoculars C) 60,000, those within about 100 light years of us D) a million, those with parallaxes of .005" or larger E) over 100 billion, almost every star in the galaxy
When an unstable nucleus decays by emitting an alpha particle, the atomic number Z of the nucleus
A) increases by 4. B) increases by 2. C) decreases by 2. D) decreases by 4. E) remains unchanged.
On a warm 30.°C spring day, you are watching Richard take a buzzer and twirl it horizontally around on the end of a 2.0 meter long string. Why do you hear the buzzer tone Vary from 718. Hz to 772. Hz? What is the angular speed?
What will be an ideal response?