Member abcd (the focus of this problem) is supported by a collar at d that can rotate and slide along bar ef, which is fixed and frictionless. structure abcd makes contact with smooth surfaces at a and c where the normal direction n to the surface at alies in a plane that is parallel to the xy-plane. force p is parallel to the y-axis. if p = 10 kn, determine the reactions at a, c and d.

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