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The chocolate crumb mystery. Explosions ignited by electrostatic discharges (sparks) constitute a serious danger in facilities handling grain or powder. Such an explosion occurred in chocolate crumb powder at a biscuit factory in the 1970 s. Workers usually emptied newly delivered sacks of the powder into a loading bin, from which it was blown through electrically grounded plastic pipes to a silo for storage. Somewhere along this route, two conditions for an explosion were met: (1) The magnitude of an electric field became 3.0×106 N/C or greater, so that electrical breakdown and thus sparking could occur. (2) The energy of a spark was 150 mJ or greater so that it could ignite the powder explosively. Let us check for the first condition in the powder flow through the plastic pipes.
Suppose a stream of negatively charged powder was blown through a cylindrical pipe of radius R=5.0 cm. Assume that the powder and its charge were spread uniformly through the pipe with a volume charge density ρ. Does E increase or decrease with increasing r ?
Match the item with the most closely related item hypoxia a. hemocytoblasts b. abundant WBCs c. agglutinogens d. neutrophil e. WBC migration f. extracellular f uid g. monocyte h. few WBCs i. low platelet count j. agglutinins k. process of blood cell formation l. low oxygen concentration