The book Elements of General Science was written by author Otis W Otis William Caldwell Here you can read free online of Elements of General Science book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Elements of General Science a good or bad book?
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3. Why is there less friction in a machine with roller or ball bearings than in one with bearings of the usual type? 4. How does a set of pulleys enable a man to accom- plish work which he could not accomplish unaided? 5. If a rope is arranged to run from a weight on the ground through a pulley attached to an elevated beam and down to your hand, will less force be needed to raise the weight than if no pulley were used ? 6. Why is one's finger more likely to be crushed in a door if caught at the... hinges than if caught at the latch ? 7. When a long ladder is being raised, why must the lower end be braced against some heavy object? 8. How and when is water power used in getting the timber from the higher hilly or mountainous regions to the more level plains or to sea level ? 186. About work in general. A great deal of the work of running water is of no immediate benefit to man. The great waterfalls of the earth may continue for many centuries with- out producing any noticeable change in the desirableness of the surrounding region as a place of human residence.
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