Problem 1.48 For the support of Prob. 1.47, knowing that the diameter of the pin is d = 16 mm and that the magnitude of the load is P = 20 kN, determine (a) the factor of safety for the pin, (b) the required values of b and c if the factor of safety for the wooden member is the same as that found in part a for the pin. Problem 1.47 A load P is supported as shown by a steel pin that has been inserted in a short wooden member hanging from the ceiling. The ultimate strength of the wood used is 60 MPa in tension and 7.5 MPa in shear, while the ultimate strength of the steel is 145 MPa in shear. Knowing that b = 40 mm, c = 55 mm, and d = 12 mm, determine the load P if an overall factor of safety of 3.2 is desired.
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The nomenclature of Soil Taxonomy is characterized by all but which one of the following statements?
A) Soil names (except for series level) identifies major soil characteristics. B) The names give a clear indication of the modes of genesis of the soil. C) The names of the orders all end with the letters sols. D) The names are based on measurable properties and not on presumed modes of genesis. E) The subgroup name also tells you the great group, suborder, and order names.
Abrasive pads or discs should be used ________
A) But clean the part thoroughly, to wash away the abrasive material B) On disassembled engine parts only C) According to the specified grit size for the material being cleaned D) All of the above
When the emergency heat feature of a heat pump is activated, the usual effect on the heat pump is _____
a. only the supplemental heaters and the blower operate b. electric heaters operate if the compression heat is inadequate c. the compressor and electric heaters operate together d. the gas or oil furnace is disabled
A two-story building is 60 X 40 with 10-foot ceilings. The ceiling consists of plaster and lath, over which 1/2" insulation has been laid. What is the expected BTUH loss with a temp differential of 25 degrees?
Fill in the blank(s) with the appropriate word(s).