Superconductivity is lost when a certain __________ is exceeded
Fill in the blank(s) with correct word
critical temperature
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A rigid rod of length l rotates about an axis perpendicular to the rod, with one end of the rod fixed to the axis. Which of the following are equal at all points on the rod? I. the angular position II. the angular velocity III. the angular acceleration IV. the centripetal acceleration V. the tangential acceleration
a. I and II b. I, II, and III c. I, II, III and IV d. I, II, III, IV and V e. I, II and IV.
Applications to Astronomy: It can be shown that the approximate age of the universe is 1/H, where H is the Hubble constant. Taking H = 20 
, estimate the age of the universe, in years. (1 ly = 9.46 × 1015 m)
A. 15 thousand years B. 15 million years C. 15 billion years D. 50 billion years
An auditorium has dimensions 10 m × 10 m × 60 m. How many moles of air fill this volume at one atmosphere and 0°C?
A. 2.7 × 102 B. 2.7 × 104 C. 2.7 × 103 D. 2.7 × 105 E. 2.7 × 106
A homeowner has a new oil furnace which has an efficiency of 60%. For every 100 barrels of oil needed to heat his house, how much (in barrels of oil) goes up the chimney as waste heat?
a. 20 b. 60 c. 40 d. 80 e. 10