Venus has a thicker atmosphere than Earth
Indicate whether the statement is true or false
TRUE
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The neutron decays into a proton, electron, and an electron antineutrino. Into what does the antineutron decay?
A. a proton, positron, and electron antineutrino B. an antiproton, positron, and electron neutrino C. a proton, electron, and electron antineutrino D. an antiproton, electron, and electron neutrino E. an antiproton, electron, and electron antineutrino
A hemispherical surface (half of a spherical surface) of radius R is located in a uniform electric field of magnitude E that is parallel to the axis of the hemisphere. What is the magnitude of the electric flux through the hemisphere surface?
a. ?R2E b. 4?R2E/3 c. 2?R2E/3 d. ?R2E/2 e. ?R2E/3
The heat conduction equation in cylindrical coordinates is
(a) Simplify this equation by eliminating terms equal to zero for the case of steady-state heat flow
without sources or sinks around a right-angle corner such as the one in the accompanying
sketch. It may be assumed that the corner extends to infinity in the direction perpendicular to
the page. (b) Solve the resulting equation for the temperature distribution by substituting the
boundary condition. (c) Determine the rate of heat flow from T1 to T2. Assume k = 1 W/(m K)
and unit depth .
GIVEN
• Steady state conditions
• Right-angle corner as shown below
• No sources or sinks
• Thermal conductivity (k) = 1 W/(m K)
FIND
(a) Simplified heat conduction equation (b) Solution for the temperature distribution (c) Rate of heat flow from T1 to T2 ASSUMPTIONS
• Corner extends to infinity perpendicular to the paper
• No heat transfer in the z direction
• Heat transfer through the insulation is negligible
SKETCH
Vaporization is the process in which
A) molecules go from the solid phase to the liquid phase. B) molecules go from the liquid phase to the gas phase. C) molecules go directly from the solid phase to the gas phase. D) electrons are stripped from atoms.