Elementary Introduction to Practical Mechanics: Illustrated by Numerous ExamplesLongmans, 1870 - 324 страници |
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Страница 8
... equal degree of compression . P It will be observed that is the strain or thrust per K square inch on the section of the beam or bar . It is also P I plain that if were equal to E then would be equal to L , K so that the modulus of ...
... equal degree of compression . P It will be observed that is the strain or thrust per K square inch on the section of the beam or bar . It is also P I plain that if were equal to E then would be equal to L , K so that the modulus of ...
Страница 21
... equal 33,000 × ≈ × 3 ; also the number of units of work re- quired to raise 13 cwts . from a depth of 140 fath . equals 13 x 112 × 140 × 6 . And since these two numbers are equal we have 33,000 × 3 × x = 13 × 112 × 140 × 6 . ..x = 12 ...
... equal 33,000 × ≈ × 3 ; also the number of units of work re- quired to raise 13 cwts . from a depth of 140 fath . equals 13 x 112 × 140 × 6 . And since these two numbers are equal we have 33,000 × 3 × x = 13 × 112 × 140 × 6 . ..x = 12 ...
Страница 38
... equal to 1 , draw ac at right angles to AB and on the same scale equal to w l , join вC ; in Aв take any point N , draw PN parallel to a c , then PN NB : CA : AB :: W : 1 . Therefore PNW NB , i.e. the ordinate PN represents on scale the ...
... equal to 1 , draw ac at right angles to AB and on the same scale equal to w l , join вC ; in Aв take any point N , draw PN parallel to a c , then PN NB : CA : AB :: W : 1 . Therefore PNW NB , i.e. the ordinate PN represents on scale the ...
Страница 39
... equal times . Ans . ( 1 ) 84,000 units to raise coal . ( 2 ) 21,356 units to raise box and rope . ( 3 ) 47 tons . Ex . 141. — In the last example suppose machinery to be employed by means of which the same drum winds up the rope of an ...
... equal times . Ans . ( 1 ) 84,000 units to raise coal . ( 2 ) 21,356 units to raise box and rope . ( 3 ) 47 tons . Ex . 141. — In the last example suppose machinery to be employed by means of which the same drum winds up the rope of an ...
Страница 44
... equal to the work that would be expended in lifting a weight equal to the sum of the weights through the same height as that through which the centre of gravity of the weights has been raised . • • Let W1 , W2 , W3 W19 . be the weights ...
... equal to the work that would be expended in lifting a weight equal to the sum of the weights through the same height as that through which the centre of gravity of the weights has been raised . • • Let W1 , W2 , W3 W19 . be the weights ...
Често срещани думи и фрази
accelerative effect angle of resistance angular angular velocity axis axle beam body brickwork cast iron centre of gravity circle circumference coefficient of friction Crown 8vo cubic foot curve cylinder described determine the number diameter direction distance draw Edition engine epicycloid equal equation equilibrium expended extrados forces acting formula given hence horizontal horse-power inclined inclined plane last Example length limiting angle line of resistance mass middle point minute moment of inertia motion moving number of feet number of units oscillation P₁ parallel forces perpendicular plane pressure principle of moments Prop pulley radius raised reaction represent respectively rest resultant right angles rope round screw sliding space square inch steam suppose surface teeth thick thread tion triangle vertical virtual velocities vols wall weight wheel Woodcuts wrought iron
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