Practical Physics |
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Page xvii
... Ratio of the Arms of a Balance and of the true Mass of a Body when the Arms of the Balance are unequal . Comparison of the Masses of the Scale Pans 14. Correction of Weighings for the Buoyancy of the Air DENSITIES AND SPECIFIC GRAVITIES ...
... Ratio of the Arms of a Balance and of the true Mass of a Body when the Arms of the Balance are unequal . Comparison of the Masses of the Scale Pans 14. Correction of Weighings for the Buoyancy of the Air DENSITIES AND SPECIFIC GRAVITIES ...
Page 5
... ratio of the electromotive force between two points of a con- ductor to the current passing between those points is a quan- tity which is constant for the same conductor in the same physical state , and is called and is the ' resistance ...
... ratio of the electromotive force between two points of a con- ductor to the current passing between those points is a quan- tity which is constant for the same conductor in the same physical state , and is called and is the ' resistance ...
Page 9
... ratio of two physical quantities of the same kind , and is accordingly a number . It will be easier to fix our ideas on this point if we consider a particular example of each of these cases , instead of discussing the question in ...
... ratio of two physical quantities of the same kind , and is accordingly a number . It will be easier to fix our ideas on this point if we consider a particular example of each of these cases , instead of discussing the question in ...
Page 10
... ratio consists of two parts : ( 1 ) the unit quantity employed , and ( 2 ) the numerical part expressing the number of times , whole or fractional , which the unit quantity is contained in the quantity measured . The unit is a concrete ...
... ratio consists of two parts : ( 1 ) the unit quantity employed , and ( 2 ) the numerical part expressing the number of times , whole or fractional , which the unit quantity is contained in the quantity measured . The unit is a concrete ...
Page 15
... ratio , and the value of k will be thereby changed . We may always determine the numerical value of k if we can substitute actual numbers for q , x , y , z , . . in the equation ( 1 ) . . For example , the gaseous laws may be expressed ...
... ratio , and the value of k will be thereby changed . We may always determine the numerical value of k if we can substitute actual numbers for q , x , y , z , . . in the equation ( 1 ) . . For example , the gaseous laws may be expressed ...
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Common terms and phrases
accuracy adjusted apparatus axis beam body bulb calculated calorimeter centimetres centre circle coincide convex lens cross-wire cubic centimetres curve cylinder deflexion density determine disc distance division drying tubes electromotive force Enter results equal equation error experiment Experiment.-Determine eye-piece fixed focal length force formula given glass glycerine grammes heat Hence horizontal hydrometer hypsometer inch inertia instrument lens light liquid magnet mark mass means measure mercury method micrometer microscope millimetre mirror moment of inertia moving object-glass observations obtained oscillation parallel passes pendulum piece placed plane pointer pole position pressure prism quantity radius ratio rays reading reflexion refraction refractive index right angles rotation scale pans screw shew shewn slide slider slit specific gravity spherometer string suppose surface tangent telescope temperature thermometer tube turn vapour velocity vernier vertical vessel vibration volume weight wire zero
Popular passages
Page 581 - It is nearly filled with the solution, and connected to the rest of the circuit by being placed on a clean copper support to which a binding screw is attached.
Page 581 - In determining by this method the constant of an instrument the current should be kept as nearly constant as possible, and the readings of the instrument observed at frequent intervals of time. These observations give a curve from which the reading corresponding to the mean current (time-average of the current) can be found. The current, as calculated by the voltameter, corresponds to this reading.
Page 580 - In employing the silver voltameter to measure currents of about 1 •ampere the following arrangements should be adopted. The kathode on which the .silver is to be deposited should take the form of a platinum bowl not less than 10 centimetres in diameter, and from 4 to 5 centimetres in depth.
Page 581 - The anode is then to be immersed in the solution so as to be well covered by it and supported in that position ; the connections to the rest of the circuit are then to be made.
Page 14 - The rate of change of momentum is proportional to the impressed force, and takes place in the direction of the straight line in which the force acts.
Page 574 - Contact is made with the mercury by means of a platinum wire about No. 22 gauge. This is protected from contact with the other materials of the cell by being sealed into a glass tube. The ends of the wire project from the ends of the tube ; one end forms the terminal, the other end and a portion of the glass tube dip into the mercury.
Page 575 - Then insert the cork and zinc rod, passing the glass tube through the hole prepared for it. Push the cork gently down until its lower surface is nearly in contact with the liquid. The air will thus be nearly all expelled, and the cell should be left in this condition for at least 24 hours before sealing, which should be done as follows : — Melt some marine glue until it is fluid enough to pour by its own weight, and pour it into the test tube above the cork, using sufficient to cover completely...
Page 182 - If three forces acting at a point are in equilibrium they can be represented in magnitude and direction by the three sides of a triangle taken in order.
Page 580 - The anode should be a plate of pure silver some 30 square centimetres in area and 2 or 3 millimetres in thickness. This is supported horizontally in the liquid near the top of the solution by a platinum wire passed through holes in the plate at opposite corners. To prevent the disintegrated silver which is formed on the anode from falling on to the kathode, the anode should be wrapped round with pure filter paper, secured at the back with sealing-wax.
Page 574 - Mix the washed mercurous sulphate with the zinc sulphate solution, adding sufficient crystals of zinc sulphate from the stock bottle to ensure saturation, and a small quantity of pure mercury. Shake these up well together to form a paste of the consistence of cream. Heat the paste, but not above a temperature of 30° C.