Superconductivity is lost when a certain ____is exceeded
a. voltage d. electric field
b. current e. critical temperature
c. resistance
E
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Which of the following statements pertaining to a vacuum flask (thermos) is NOT correct?
A. Silvering reduces radiation loss B. Vacuum reduces conduction loss C. Vacuum reduces convection loss D. Vacuum reduces radiation loss E. Glass walls reduce conduction loss
What is the typical main sequence lifetime of an M-type star?
A) one million years B) ten million years C) one billion years D) ten billion years E) a trillion years
During retrograde motion, a planet moves from ________ to ________ relative to the stars.
A. west; east (moves eastward) B. east; west (moves westward)
A common way a robotic spacecraft can be accelerated and have its trajectory changed without the use of any fuel is via
A) a gravitational slingshot from another spacecraft B) radiation pressure from the Sun C) the ejection of mass from the probe D) a gravitational slingshot from another planet