Which of these color code patterns is found on a 270 ? ±5% resistor?
A) Red, violet, brown, silver B) Red, violet, black, gold
C) Red, violet, black, silver D) Red, violet, brown, gold
D
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The ____________________ states that if the same number is subtracted from both sides of an equation, the sides remain equal, and the equation remains balanced.
Fill in the blank(s) with the appropriate word(s).
Computer analysis of a truss. The purpose of this study is to show that the magnitude of the joint displacements as well as the magnitude of the forces in members may control the proportions of structural members. For example, building codes typically specify maximum permitted displacements to ensure that excessive cracking of attached construction, such as exterior walls and windows, does not occur (Photo 1.1 in Section 1.3). A preliminary design of the truss in Figure P4.53 produces the following bar areas: members 1 through 4, 5 in. 2 , and members 5 and 6, 2 in. 2 . Also E = 29,000 kips/in. 2 . Case 1: Determine all bar forces, joint reactions, and joint displacements, assuming pin joints. Use the computer program to plot the deflected shape. Case 2: If the maximum horizontal
displacement of joint 4 is not to exceed 0.25 in., determine the minimum required area of the diagonal truss bars, members 5 and 6. For this case assume that the diagaonal members have the same areas, while all other truss members have cross-sectional area of 5 in. 2 . Round the area to the nearest whole number. Photo 1.1: Wind damage. Shortly after thermopane windows were installed in this high-rise office building, they began failing and falling out, scattering broken glass on passers-by beneath. Before the building could be occupied, the structural frame had to be stiffened and all the original glass panels had to be replaced by thicker, tempered glass—costly procedures that delayed the opening of the building for several years.
Which of the following is not listed in the book as one of the five most common woods used for exterior siding materials?
A) Oak B) Douglas-fir C) Redwood D) Fir
All of the following statements about oxygen are true, EXCEPT:
A. Oxygen makes up 78 percent of the air we breathe. B. Oxygen is essential to all animal life. C. Oxygen combines readily with other elements to form complex chemicals. D. Oxygen is normally a gas.