A Plain and Easy Introduction to the Newtonian Experimental Philosophy ...: Illustrated by Six Copper-plates ...

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author, 1765 - Science - 164 pages

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Page 141 - ... bins 755 bushels of grain; there being in the first 125 bushels, and in the second 96 bushels, more than in the third ; how many bushels in the second and third ? Ans. 363 in the second, 267 in the third. 3. There is a certain island 30 miles in circumference. If A and B commence travelling round it, A at the rate of 3 miles an hour, and B at the rate of 5 miles an hour, how far apart will they be at, the end of 30 hours ? 4. Having money to invest, I purchased two farms at $ 1,750 each, and...
Page 115 - ... that a body plunged in a fluid loses as much of its weight as is equal to the weight of an equal volume of the fluid.
Page 93 - Miles, which is alfo the Breadth of the Ring ; but what this wondrous Phenomenon is, has not as yet been difcovered. 29. The MOON which belongs to our Earth is at the Diftance of about 240,000 Miles ; and revolves in the Space of 27 Days 7 Hours and 43 Minutes. This is called the periodical Month ; but the Time which pafles between two r.ew Moons is 29 D. D.
Page 142 - A walks at the rate of 3 miles per hour, and B at the rate of 4 miles per hour, after how many hours do they meet and how many miles does A walk ? 20.
Page 140 - ... Our earth, which we consider as a planet, is 24 hours in performing one revolution on its axis; in that period of time, therefore, we have a day and a night. Hence this revolution is called the earth's diurnal or daily motion ; and it is this revolution of the earth from west to east which produces an apparent motion of the sun, moon, and stars, in a contrary direction. Let us now suppose ourselves to be beings, independent of any planet, travelling in the skies, and looking upon the earth in...
Page 158 - ... so that it may revolve freely, carrying round with it the attached wheel. On the axis is coiled a rope which sustains the weight ; and round the periphery of the wheel is coiled another rope, in a contrary direction, to which is suspended the power. Then supposing the machine to be put in motion, the velocity of the power will be to that of the weight, as the circumference of the wheel to that of the axle ; for it will be perceived that the power must sink through a space equal to the circumference...
Page 135 - ... and force through a pipe that comes down into it ; and makes a continued uniform stream by the condensation of the air upon its surface in the vessel.
Page 157 - By the best authority, the quantity of matter in the moon is to that in the earth, as 1 to...
Page 146 - The change of motion is always proportional to the moving force impressed, and is always made according to the right line, in .which that force is impressed.

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