Charge of uniform surface density (4.0 nC/m2) is distributed on a spherical surface (radius = 2.0 cm). What is the total electric flux through a concentric spherical surface with a radius of 4.0 cm?
a. 2.8 N × m2/C
b. 1.7 N × m2/C
c. 2.3 N × m2/C
d. 4.0 N × m2/C
e. 9.1 N × m2/C
C
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The following data was recorded for the complete recrystallization of heavily cold-worked copper by B.F. Decker and D. Harker, Trans. AIME 188 (1950) 887. Cold work results in the formation of many dislocations and other defects in crystalline grains. Recrystallization is the growth of new low-defect grains from the highly defective grains.
(a) Plot the logarithm of the rate of recrystallization versus the inverse of the absolute temperature (1/T) to see if it is linear.
(b) Calculate the activation enthalpy for the recrystallization of copper.
(c) The activation enthalpy for vacancy diffusion in an annealed crystal of copper is 2.2 eV/atom. Discuss possible reasons for any difference in your result from part (b).
(d) Determine the temperature where copper completely recrystallizes in 1 hour. This is called the recrystallization temperature.
What physical feature of our planet is most dependent on supernova events?
a. oceans of water b. a breathable atmosphere c. organic chemicals d. uranium in Earth's interior e. a nickel-iron core
Time Dilation: A set of twins, Andrea and Courtney, are initially 10 years old. While Courtney remains on Earth, Andrea rides on a spaceship that travels away from Earth at a speed of 0.60c for 10 years (as measured by Courtney). At the end of the trip, Courtney is 20 years old. How old is Andrea?
A. 10 years B. 12 years C. 18 years D. 20 years
The ________ theory describes the origin of the planets as having been formed by accretion of small particles into progressively larger and larger bodies
Fill in the blank(s) with correct word