A text-book of general physics for colleges; mechanics and by Joseph Albertus Culler

By Joseph Albertus Culler

Initially released in 1909. This quantity from the Cornell collage Library's print collections used to be scanned on an APT BookScan and switched over to JPG 2000 layout via Kirtas applied sciences. All titles scanned disguise to hide and pages may well comprise marks notations and different marginalia found in the unique quantity.

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Numerous applications of these principles will be found in later pages of this work. Fig. 20. 15. Methods of Calculating Resultants. —Two methods — are commonly used in finding the magnitude and direction of the resultant when the components are known, ^namely, the graphical and the mathematical. By the graphical method exact drawings are made in the manner just indicated, the vectors being drawn on some convenient scale and true in direction. The resultant is then measured and its value found from the scale adopted.

Tangular coordinates and resolve Through o draw rec- each force into its components along the X- and Y-axes. The and of are posiand og are negative. Also, ea and hd are positive and fb and gc are negative. By measurement and addition, all the forces may thus be composed into two at right angles. The re- components oe tive, while oh Fig. 46. sultant can then be easily found. When the angles made by the vectors with the axes are known, the values of the components can most easily be calculated from the simple trigonometrical relations.

The motion of the earth periodic, the period being one year. around the Each succeeding year a repetition of the events of the previous year. Any recurring movement of this character is periodic, and numerous examples is may be cited. Fig. 32. If the periodic path, it is motion is forward and backward in the same Thus, a pendulum or called a vibration or oscillation. tuning-fork is said to vibrate. One very important kind monic motion, which of periodic motion may be defined as the is simple har- movement point to and fro along a line in such a manner that tion is proportional to its displacement.

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