Is peak nucleate boiling a stable boiling condition?
What will be an ideal response?
Peak nucleate boiling is not stable in the sense that any increase or decrease in the temperature difference between the heating surface and the saturated fluid will decrease the actual amount of heat transfer to the boiling liquid.
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The weight of the insulation in a spacecraft may be more important than the space required. Show analytically that the lightest insulation for a plane wall with a specified thermal resistance is the insulation that has the smallest product of density times thermal conductivity.
GIVEN Insulating a plane wall, the weight of insulation is most significant FIND Show that lightest insulation for a given thermal resistance is that insulation which has the smallest product of density (?) times thermal conductivity (k) ASSUMPTIONS One dimensional heat transfer through the wall Steady state conditions
Three identical point charges Q are placed at the vertices of an equilateral triangle (length of each side = 2.0 m). If Q = 60 ?C, what is the magnitude of the electrostatic force on any one of the charges?
A. 25 N B. 19 N C. 14 N D. 22 N E. 16 N
One terminal of a battery is connected to a closed circuit, while the other terminal is left unconnected. Which of the following statements is true?
A) No current flows through the battery, and the potential of any point in the circuit is the same. B) No current flows through the battery, and the potentials of different points in the circuit are different. C) Current flows through the battery, and the potential of any point in the circuit is unchanged. D) Current flows through the battery, and the potentials of different points in the circuit are different.
Which of the following polymers is a hydrocarbon?
a. Polyethylene b. PVC c. Teflon d. Dacron