Answers to the practical questions and problems in by J DORMAN STEELE

By J DORMAN STEELE

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Does a ft. * (no. of oz. in 1 cu. It ft. ton of copper? = 600,000 oz. = = 300,000 oz. = deadfish always float on swimming bladder its 37,500 Ibs. 750 Ibs. back ? located just under the spine; body, and, of course, comes this is the lightest part of its to the top as soon as the fish dies. l. , the weight of a cu. ft. of water, should be reduced to Troy weight, and the Ib. gold taken as 12 oz. Troy, when in the ans. 36 cu. ft. IN A 36. would it Mercury vessel holds 10 A Ibs. trcury contain ? 5 10 Ibs.

Heard (See p. 1 2. A ft. -*- ft. 1090 x 60 = ft. = 310,800 ft. = 4 min. ) 50 gee. let*fall into a well, and in 4 seconds to strike the bottom. deep was the well? ) d= 16 x f. What lime would it 16 x 4 2 = 256 ft. require for a sound to travel 5 miles in tke still water of a lake ? 6280 26,400 ft. ft. -i- x5 = 26,400 ft. ft. ) 4700 How much louder will be the report of a gun to an 13. observer at a distance of 20 rods than to one at half a mile? 160 rod? are 8 times 20 rods. The intensity of the sound is inversely as the 1 Hence the sound is 64 times louder to the square of the distance = /64 .

P. ) 19. Why does it whiten molasses candy to pull it? Water is given up both in cooking and pulling. This causes more light to be reflected (Q. 16), while the crystals formed, especially on the surface, hide the impurities. Why does plastering become lighter in color as it dries ? Because, as the water evaporates, the mortar transmits less light, and reflects more light to the eye. 20. i1 . " Kerosene oil-flame emits only heat and color, but no actinic Some dark-rooms" are lighted with yellow glass windows.

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