The distance between adjacent orbit radii in a hydrogen atom
A) increases with increasing values of n.
B) decreases with increasing values of n.
C) varies randomly with increasing values of n.
D) remains constant for all values of n.
A
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In petroleum processing plants, it is often necessary to pump highly viscous liquids such as asphalt through pipes. To keep pumping costs within reason, the pipelines are electrically heated to reduce the viscosity of the asphalt. Consider a 15-cm-OD uninsulated pipe and an ambient temperature of 20°C. How much power per meter of pipe length is necessary to maintain the pipe at 50°C? If the pipe is insulated with 5 cm of fiberglass insulation, what is the power requirement?
GIVEN • An electrically heated pipe • Diameter (D) = 15 cm = 0.15 m • Pipe surface temperature (Tsp) = 50°C FIND (a) Power per meter (qe/L) required with no insulation (b) Power per meter required with 5 cm (0.05 m) of fiberglass insulation ASSUMPTIONS • The pipe is horizontal and in quiescent air • Radiative heat transfer is negligible • No heat is transferred to the fluid in the pipe PROPERTIES AND CONSTANTS for dry air at the mean temperature of 35°C Thermal expansion coefficient (?) = 0.00325 1/K Thermal conductivity (k) = 0.0262 W/(m K) Kinematic viscosity (?) = 17.1 × 10–6 m2/s Prandtl number (Pr) = 0.71 the thermal conductivity of fiberglass (kfg) = 0.035 W/(m K)
The four states of matter are solid, fluid, gas, and plasma
Indicate whether the statement is true or false
Heat is extracted from a hot reservoir during a(n) ________ expansion in a Carnot cycle.
Fill in the blank(s) with the appropriate word(s).
The star Aldebaran is a red giant, and is much more luminous than the Sun. What conclusions can be drawn from this fact?
A. In the H-R diagram, Aldebaran is above and to the left of the Sun. B. Aldebaran is cooler than the Sun, but has larger diameter than the Sun. C. Aldebaran is a binary star. D. Aldebaran is hotter and much more massive than the Sun. E. None of these choices is correct.