Assuming Stokes behavior, calculate the terminal settling velocity in standard air () for the following particles: (a) diameter = 25 μm, specific gravity = 1.9; (b) diameter = 2.5 μm, specific gravity = 0.8; and (c) diameter = 45 μm, specific gravity = 2.6

The sum of the normal stresses does not change as the stress state rotates through an angle. a)-trune b)- false

Determine the time of the day and month of the year at which the peak sensible cooling load occurs for a top floor, north-eastern corner room of an office building in durban for the following conditions: floor area: 8 x 8 x 3 m east and north walls: 115 mm face brick (outside), 20 mm air space, 115 mm ordinary brick (inside) with 15 mm plaster roof construction: suspended plasterboard ceiling, 450 mm air space, 150 mm concrete, 75mm screed, waterproofing no heat transfer across other surfaces window area 3x 1,5 m high in north wall only. ordinary glass with venetian blinds. lights and occupants : from 07: 00 to 18: 00 average light density: 25 w/m2 number of occupants : 5 seated, light office work room temperature 24°c

Define thermoplastic polymers and thermosetting polymers in terms of their structures, and (ii) describe briefly a process suitable for the production of products from each type of polymer.