(a) 20 lb # ft to N # m, (b) 450 lb ft3 to kN m3, and (c) 15 ft h to.

Furthermore, rigid-body mechanics is essential for the age of wonders 3 patch gog design and analysis of many types of structural members, mechanical components, or electrical devices encountered in engineering.

The direction of each force is specified by the angle its line of action makes with one of the axes, or by a slope triangle.

Determine the magnitude of the resultant force and its direction measured counterclockwise from the positive x axis.Set F 500.Cos a2 -212.1 700 ; a2 108 Ans.Because these components form a right triangle, they can be deter- mined from Fx F cos u and Fy F sin u Instead of using the angle u, however, the direction of F can also be defined using a smallslopetriangle, as in the example shown.Through the use of photographs placed throughout the book, theory is applied in a simplified way in order to illustrate some of its more important conceptual features and instill the physical meaning of many viii preface.It is hoped that this realism will both stimulate the students interest in engineering mechanics and provide a means for developing the skill to reduce any such problem from its physical description to a model or symbolic representation to which the principles of mechanics may.Know the rules for rounding off numbers.

216 represent the magnitudes of the components, which are always positive scalars.

As shown in Fig.

The final result should then be expressed using a single prefix.

Description, visibility, others can see my Clipboard.

Likewise, mm2 represents (mm)2 mm #.

Tail Line of action 1 ead A 20 Fig.220b contribute a greater pull to the left than F2 which pulls to the right.Once they have been obtained, the coordinate direction angles a, b, g can then be determined from the inverse cosines.The mutual forces of action and reaction between two particles are equal, opposite, and collinear, Fig.Your answer specific feedback.2.5 cartesian vectors 45 2 An easy way of obtaining these direction cosines is to form a unit vector uA in the direction of A, Fig.Equilibrium v F2F1 F3 (a) Second Law.Convert each of the following to three significant figures.We will define the direction of A by the coordinate direction angles a (alpha b (beta and g (gamma measured between the tail of A and the positive x, y, z axes provided they are located at the tail of A, Fig.229, then the resultant vector, R, has components which are the scalar sums of the i, j, k components of A and B,.e., R A B (Ax Bx)i (Ay By)j (Az Bz)k If this is generalized and applied to a system of several concurrent.8 chapter 1 general principles 1 SI Units.If time permits, sections involving more advanced topics, indicated by stars may be covered.If FB 3 kN and u 45, determine the magni- tude of the resultant force of the two tugboats and its direction measured clockwise from the positive x axis.Instead, problems of this type are easily solved by using the rectangular- component method, which is explained in Sec.