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A Text-Book of Physics, Largely Experimental; Including the Harvard College "descriptive List of Elementary Exercises in Physics"
A TextBook of Physics Largely Experimental Including the Harvard College descriptive List of Elementary Exercises in Physics Author:Edwin Herbert Hall General Books publication date: 2009 Original publication date: 1897 Original Publisher: H. Holt and company Subjects: Physics Science / Mathematical Physics Science / Nuclear Physics Science / Physics Science / Quantum Theory Notes: This is a black and white OCR reprint of the original. It has no illustrations and there may be t... more »ypos or missing text. When you buy the General Books edition of this book you get free trial access to Million-Books.com where you can select from more than a million books for free. Excerpt: (4) A block whose specific gravity is 0.5, and which weighs 100 gm. alone in air, is fastened to a sinker that weighs 150 gm. alone in water. How much will both together weigh in water? (5) A certain body has the density 187.2 in pound and foot units. What is its specific gravity ? (6) Is the specific gravity of the human body much greater or much less than 1 ? (7) Why does filling the lungs with air help one to float in water ? EXERCISE 1. SPECIFIC GRAVITY OF A LIQUID: TWO METHODS. Apparatus : The gallon jar (No. 10) nearly filled with water, and the smaller jar (No. 15) nearly filled with a solution of sulphate of copper. The small glass bottle (No. 16). The spring-balance (No. 7). Thread. First Method. Weigh the bottle empty. Dip the bottle into the jar of sulphate of copper and let it fill with the liquid. Holding the bottle over the jar, put the stopper in place, thus crowding out the excess of liquid, then wipe the outside of the bottle and weigh it carefully with its contents. Pour the sulphate of copper back into its jar, then fill the bottle with water, just as it was before filled with the other liquid, and again weigh the bottle and its contents. From the three weighings now made the specific gravity of sulphate of copper can easily be found. Second Method. We found in Exercise 2 that a body going from air into water lost in apparent weight an amount equal to the weight of its own bulk of water. So a body going from air ...« less