Exercises in Practical Physics for Schools of Science, Τόμος 1

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Macmillan and Company, limited, 1899
 

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Σελίδα 146 - If three forces, acting at a point, be represented in magnitude and direction by the sides of a triangle taken in order, they will be in equilibrium...
Σελίδα 146 - IV. // any number of forces acting at a point can be represented in magnitude and direction by the sides of a polygon taken in order, they will be in equilibrium.
Σελίδα 143 - The Parallelogram of Forces.— If two forces acting at a point be represented in magnitude and direction by the adjacent sides of a parallelogram, the...
Σελίδα 143 - If two forces acting at a point be represented in magnitude and direction by the adjacent sides of a parallelogram, the resultant of these two forces will be represented in magnitude and direction by that diagonal of the parallelogram which passes through the point.
Σελίδα 103 - When the temperature remains the same, the volume of a gas varies inversely as the pressure.
Σελίδα 72 - For practical purposes, it may be defined as the ratio of the mass of a substance to the mass of an equal volume of water at the similar temperature.
Σελίδα 174 - Conversion of Scales. — It should be clear from what we have said that the interval between the boiling and freezing points, that is the same temperature difference, is divided into 100 parts on the Centigrade scale and 180 parts on the Fahrenheit, and consequently 100 Centigrade degrees are equal to 180 Fahrenheit degrees, which is the same as saying one degree Centigrade is equal to nine-fifths of a Fahrenheit degree. Or one degree Fahrenheit is equal to five-ninths of a degree Centigrade.
Σελίδα 159 - City the acceleration of gravity is g= 980.26 ; at the Equator, g=. 978.1 ; at the North Pole, g= 983.1. 2262. The unit of force is the dyne, and is that force which, acting on a mass of one gram for one second, gives to it a velocity of one centimeter per second. For an example of force and the application of the unit of force, see Art. 2214. 2263. The unit of work is the erg, and is that amount of work performed when a force of one dyne is overcome through a distance of one centimeter ; that is,...
Σελίδα 96 - ... thumb. A column of mercury will be supported in the tube by the pressure of the atmosphere. The distance between the top of the column and the surface of the mercury in the cup will be about thirty inches.
Σελίδα 165 - Hence (2) the time of vibration of a pendulum varies as the square root of its length.

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