New PDF release: A text-book of general physics for colleges; mechanics and

By Joseph Albertus Culler

Initially released in 1909. This quantity from the Cornell college Library's print collections was once scanned on an APT BookScan and switched over to JPG 2000 layout through Kirtas applied sciences. All titles scanned hide to hide and pages may perhaps contain marks notations and different marginalia found in the unique quantity.

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Extra info for A text-book of general physics for colleges; mechanics and heat

Example text

Then h may a and be resolved into two components, bcosd, which X-axis and so can be added to a, and b sin 6, which is 2l_ parallel to the Y-axis and so is at right angles to a. we have two along the Now vectors at right angles and can solve as above by equation (18). A is general equation — for k calculating the magnitude of the resultant may be deduced Fig. 23. Referring to Fig. 23, where a and b are the two components whose resultant is to be found, the vector value along the X-axis is seen to be a+b cos d, and along the Y-axis Hence the square of the resultant is equal to the it is b sin 0.

The moment of a force is the product by the perpendicular distance from the axis of Moment of that force . 8. rotation to the line of direction of the force. axis about rotate. F The moment applied at oa, is F . Thus, let o be an which a body oa may of. /, It is the importance as the distance of the force perpendicular to observed that F increases from o increases. of It is a common experience that the longer the arm of a lever the greater will be the effect of any given force in producing rotation about the fulcrum the axis of rotation.

Take b, 2 cm. from the force of 6 dynes. The negative moments are and Their sum is —212. The positive mo20X6, 6X2. 10X8, — is 8X4= -1-32. The sum of these is 180. Consequently, the 28 dynes must be applied at such a point that its moment ment be + 180. The distance from b is therefore 6f cm.

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


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