Laboratory Physics: A Students Manual for Colleges and Scientific Schools

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Ginn, 1903 - 403 pagini

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Pagina 54 - When the sum of the moments tending to cause rotation in one direction is equal to the sum of the moments tending to cause rotation in the opposite direction, the object is in balance.
Pagina 266 - Two solutions are required: one, the reducing solution, should be prepared at least a week before it is used, and it may be made in large quantity and kept in stock with advantage ; the other solution is to be prepared when used. REDUCING SOLUTION Distilled water 700 ccm Pure sugar (loaf, granulated, or rock candy) ... 80 g When dissolved add Alcohol 175 ccm Strong nitric acid (sp. gr. 1 .42) 3 ccm Add water to make 1000 ccm For silvering, the mirror may rest face up on the bottom of a suitable dish;...
Pagina 11 - ... the reports from the different corps of correspondents are very nearly identical and how often the final figures arrived at by the individual members of the board agree with each other. These State estimates, which are in percentages, are then multiplied into the acreages for their respective States. The sum of these products is divided by the sum of the acreages giving the percentage for the entire crop for the United States. METHOD OF ISSUING REPORTS. Reports in relation to cotton 'thus prepared...
Pagina 191 - ... ice will extract heat from the atmosphere to fuel its transformation into liquid. The heat needed to melt a substance is referred to as the heat of fusion (sometimes called the latent heat of fusion) and is defined as the calories required to change 1 gm of the substance, or the Btu to change 1 Ib of the substance, from the solid to the liquid state without changing its temperature. It is called latent because at a specific temperature, the melting point, the energy of the applied heat is utilized...
Pagina 117 - The viscosity of a substance is defined as the tangential force per unit area of either of two horizontal planes at unit distance apart, one of which is fixed while the other moves with unit velocity, the space between the planes being filled with the substance.
Pagina 120 - The density p of a substance is the ratio of its mass to its volume and may be expressed in units of pounds per cubic foot (lb/ft3) or kilograms per cubic meter (kg/m3).
Pagina 51 - In other words, the sum of the momenta before impact is equal to the sum of the momenta after impact ; this is the principle of the Conservation of Momentum.
Pagina 51 - ... velocity after the collision. Hence, in a perfectly elastic collision the relative velocity is reversed in direction but unaltered in magnitude. The degree to which a pair of colliding bodies approach perfect elasticity is expressed by their coefficient of restitution, e, which is defined as the negative ratio of the relative velocity after collision to the relative velocity before collision.
Pagina 117 - ... at unit distance apart, one of which is fixed while the other moves with unit velocity, the space between being filled with a viscous substance.
Pagina 324 - It is defined as 107 ergs, or as the work done in 1 second by a current of 1 ampere in flowing through a resistance of 1 ohm.

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