For piping assemblies, screwed fittings cannot be used for: (a) galvanised piping as corrosion may develop around the threaded section (b) high flow applications as turbulence may be initiated at the threaded section (c) sections that have to be dismantled for maintenance (d) low pressure applications as the depth of the pipe thread reduces the pressure rating of the pipe.

In november 1987, a massive iceberg broke loose from the antartic ice mass and floated free in the ocean. the chunk of ice was estimated to be 98 mi long, 25 mi wide, and 750 ft thick. a typical backyard swimming pool contains about 24,000 gallons of water. how many of these pools could you fill from the water in this iceberg? (assume the iceberg is a rectangular solid of the above dimensions and consists of water only). express answer in scientific notation.