ما يقوله الناس - كتابة مراجعة
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الصفحة 22 - There is an equilibrium upon the wheel and axle when the power is to the weight as the radius of the axle to the radius of the wheel.
الصفحة 20 - Hence it is evident, that in every species of lever there will be an equilibrium, when the power is to the weight as the distance of the weight from the fulcrum is to the distance of the power from the fulcrum.
الصفحة 54 - Tlie distance of the centre of gyration from the axis of motion, is a mean proportional between the distances of the centres of gravity and percussion from that axis.
الصفحة 240 - The plane of the equator is inclined to the plane of the ecliptic at an angle of 23° 27' 34"'69 ; and the inclination of the lunar orbit to the same is 5° 8
الصفحة 23 - Find the work done if the weight is raised 60cm. 707. With the Screw, the ratio of the power to the weight is equal to the ratio of the distance between two consecutive threads to the circumference described by the end of the power arm. 218. The power arm of a screw is 16 in. long, and by one turn of the screw the head advances one eighth of an inch. If the power is 3 lb., find the weight lifted. 219. In a screw used to...
الصفحة 185 - The azimuth3' of a celestial object is measured by an arc of the horizon, intercepted between the meridian and a vertical circle passing through the object.
الصفحة 60 - This property is demonftrated only on a fuppofition that the whole mafs of the pendulum is concentrated in a point: but this cannot take place in any really vibrating body ; and when the pendulum is of finite magnitude, there is no point given in pofition which...
الصفحة 247 - These phenomena do not, however, occur at every new and full moon ; and the reason is, that the plane of the moon's orbit is inclined to that of the ecliptic, and that these two planes meet one another only in their line of common section, which passes through the centre of the earth.