If a light-weight stable nucleus has 12 neutrons, the atomic mass is expected to be about:
a. 6 b.12 c.18 d.24 e.36 amu.
d
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A cryogenic fluid is stored in a 0.3-m-diameter spherical container in still air. If the convection heat transfer coefficient between the outer surface of the container and the air is 6.8 W/(m2 K), the temperature of the air is 27°C and the temperature of the surface of the sphere is –183°C, determine the rate of heat transfer by convection.
GIVEN
• A sphere in still air
• Sphere diameter (D) = 0.3 m
• Convective heat transfer coefficient ch = 6.8 W/(m2K)
• Sphere surface temperature (Ts) = –183°C
• Ambient air temperature (T?) = 27°C
FIND
• Rate of heat transfer by convection (qc)
ASSUMPTIONS
• Steady state heat flow
SKETCH
Star X has an apparent magnitude of 3, and star Y has an apparent magnitude of 8. How do they compare in observed brightness?
A) Star X is 100 times brighter than star Y. B) Star X is 5 times brighter than star Y. C) Star Y is 100 times brighter than star X. D) Star Y is 5 times brighter than star X.
A charge Q is uniformly spread over one surface of a very large nonconducting square elastic sheet having sides of length d
At a point P that is 1.25 cm outside the sheet, the magnitude of the electric field due to the sheet is E. If the sheet is now stretched so that its sides have length 2d, what is the magnitude of the electric field at P? A) 4E B) 2E C) E D) E/2 E) E/4
Explain why California would mandate the installation of catalytic converters in cars at a time when their use cost energy and degraded performance
What will be an ideal response?