This would, however, have been a most costly and bungling way of navigation. Why will the foam all collect in the hollow at the centre? Describe the rudder of a boat as a lever. The water is the F, the boat the V, and the hand the P. As the W is between the F and the P, it is a lever of the second class. Show the change that occurs from the second to the third class of levers, when you take hold of a ladder at one end and raise it against a building.
At first the ground is the F at one end, the hand the P at the other, and the ladder the W hanging between; hence this is a lever of the second class. After a little, the F remaining the same, the P is applied at one end, near the F, and the ladder is the WV hanging, at the other; hence this is now a lever of the third class. Why is a piinch from the tongs near the hinge more severe than one near the end? Because in the former case the tongs are a lever of the first class-in the latter, of the third. In the first class there is a gain of power, in the third a loss.
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Two 5ersons are carrying a weight of lbs. Whe e should it be suspended so that one will lift only 50 lbs.? One lifts 50 lbs.
The proportionate length of the arms of the lever should be the same as the proportionate weights-i. In a lever of the first class, 6 feet long, where should the F be fplaced so that a P of I lb. The W must be placed 3 in. What P would be required to lift a barrel of fiork with a windlass whose axle is one foot in diameter and handle 3 ft. P: W: rad. WHhat number of movable pzulleys would be required to;ift a W of lbs.
How many lbs. What weight could be lifted with a single horseowe, 33, lbs.
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This block has 3 movable pulleys, and using the equation of the pulleys given in the last two problems, we have, making no allowance for friction, 33, lbs. What distance should there be between the threads oj a screzwe, that a Pof 25 lbs. F: W:: Interval: Circumference. How high could a P of 12 lbs. P: W:: height: length. I wish to roll a barrel of flour into a wagon, the box of which is 4ft. How Ionff a plank should I get? The "evenzer" of apair of whifclrees is 3 J. For every 3 lbs. Hence one arm of the evener must be 6 in.
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Or, if we prefer, we may say 21 in. See Prob. In a set of three horse wshiffletrees, haing an "evene"? For every lb. Hence one arm mast be 20 in.. The single horse should draw 3 lbs. What W can be lifted with a P of 0oo lbs. What is the object of the big balls cast on the ends of the Fandle of the screw used in cohying-firesses?
By their inertia and centrifugal force they make the motion more uniform and continuous. In a steelyard 2ft. How heavy a body can be weighed with a I lb. Describe the changefrom the Ist to the 3d class of levers, il the ditSerent ways of using a spade. When digging, the ground at the back of the spade is the F; the ground lifted is the W; and the hand at the other end is the P.
When throwing dirt, the left hand at one end of the spade is the F; the dirt at the other end is the W, and the right hand between the two is the P. As the P is between the F and the W, this is a lever of the 3d class. W Vhy are not blacksmiths' and fire tongs constructed on the same princihle P The former are of the Ist class, as power is required: the latter of the 3d class, as rapidity only is necessary.
In a lever of the 3d class, what y will a P of 50 lbs. P: W:: Wd: Pd. In a lever of the 2d class, what IV will a P of 50 lbs. In a lever of the Ist class, what Wgwill a P of 50 lt. A balance. Required the circumference of thu wheel.
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P: W:: diameter of axle: diam. Required the circumference of the axle. What P would be necessary to sustain a weight o0 3, lbs. Iowr many movable pfilleys would be required to sustain I Wof lbs. Why do housekeepfers test the strength of lye, b trying whether or not an egg will float on it? The potash dissolved in the water to form lye increases the density of the liquid. When enough has been dissolved to make its specific gravity greater than that of the egg, the egg will float.
This becomes, therefore, a simple means of testing the amount of potash contained in the lye. How much water will it take to make a gallon of strong brine. A gallon. The salt does not increase the bulk of the liquid.
Why can afat man swim easier than. Because muscles and bones are heavier than fat. The specific gravity of a fat man is therefore less than that of a lean one. Why does thefiring of a cannon over the watersometimes bring to the surface the body of a drowned person. It is probable, also, that the firing of the gun produces a partial vacuum, or in some way takes off, for an instant, a part of the pressure of the air on the water.
The gases in the body would then expand and bring it to the top. The pressure of the water is less as they near the top, and so they expand. What is the pressure on a lock-gate 14 feet high and Io feet wide, when the lock is full of water f 14 x 10 x 7 x oz. Will a iail of water weigh any more with a live fish in it than without?
If the pail were full before the fish was put in, then it will make no difference, since the fish will displace its own weight of water, which will run over. If the pail is only partially filled, then, though the fish is upheld by the buoyancy of the water, since action is equal to reaction, it adds its own weight to that of the water. If the water filtering down through a rock should collect in a crevice an inch square and feet high, opening at the bottom into a closed fissure having 20 square feet of surface, what would be the total pressure tending to break the rock?
The pressure is the same on every square inch of the twenty square feet of surface.
Why can stones in water be moved so mnuch more easily than on land? Because the water oaoys up about one-half of their weight. Why is it so difficult to wade in the water where there is any current? Because the buoyant force of the water makes us so light that we are easily carried away from our footing.
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Why is a mill-dam or a canal embankment small at the tofp and large at the bottom? Because the pressure of the water increases with the depth. In digging canals and building railroads, ozught not the engineer to take into consideration the curvature of the earth? If he should build on a true level he would find his embankment pointing up to the stars. Is the water at the bottom of the ocean denser than thal at the surface? The immense pressure must condense it very much at great depths. There is a certain point beyond which divers cannot penetrate. Why does the bubble of air in a spzrit-level move as the instrument is turned?
Because the air is lighter than the alcohol and rises constantly to the highest point. For this reason, also, the tube is curved upward at the centre. Why can a swimmer tread on glass and other sharp substances at the bottom of the water with ithttle harm?
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