Which of the following explains why geotechnical engineers study plate tectonics and soil mechanics? A to understand detrimental effects of wind events
B to understand subsurface conditions where structures are built
C to ensure materials in the structure can support the load
D to ensure the physical structure is safe for human use

Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk

Slip occurs via two partial dislocations because of (a) the shorter path of the partial dislocation lines; (b) the lower energy state through partial dislocations; (c) the charge balance.

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