Three wires, each carry 2 A into in a junction. From that junction emerge two other wires carrying the current away. What could the current in those two wires be?
1.2 A each
2.6 A each
3.3 A each
4.4 A each
3
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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)
Humanity is very new to the Universe
a. True b. False Indicate whether the statement is true or false
Due to the dust in the interstellar medium, a distant star will appear to an observer on Earth to be
a. brighter and cooler than it really is. b. brighter and hotter than it really is. c. fainter and cooler than it really is. d. fainter and hotter than it really is. e. unchanged in brightness or apparent color.
A 60. kg person walks along a 100. kg log at the rate of 0.8 m/s (with respect to the log). With what speed does the log move, with respect to the shore?
What will be an ideal response?