Elementary Introduction to Practical Mechanics: Illustrated by Numerous ExamplesLongmans, 1870 - 324 страници |
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Страница 38
... 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 weight of the rope left ...
... 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 weight of the rope left ...
Страница 52
... straight line AB , 8 ft . long ; forces of 5 lbs . and 7 lbs . act at △ and в respectively at right angles to AB and in opposite directions . Determine their resultant . 30. Conditions of Equilibrium of Three Parallel Forces . In the ...
... straight line AB , 8 ft . long ; forces of 5 lbs . and 7 lbs . act at △ and в respectively at right angles to AB and in opposite directions . Determine their resultant . 30. Conditions of Equilibrium of Three Parallel Forces . In the ...
Страница 55
... right angles to each other by forces of 120 and 100 lbs . respectively ; determine the magnitude and direction of the resultant pull on the point A. ( See fig . a . ) : Along * AP measure on scale AB containing 120 units of length , and ...
... right angles to each other by forces of 120 and 100 lbs . respectively ; determine the magnitude and direction of the resultant pull on the point A. ( See fig . a . ) : Along * AP measure on scale AB containing 120 units of length , and ...
Страница 61
... right angles to AB , then R , the reaction of the plane , must act along ED , and we have three forces P , w and R in equilibrium acting in known directions ; and since the magnitude of w is known , that of R and P can be found by the ...
... right angles to AB , then R , the reaction of the plane , must act along ED , and we have three forces P , w and R in equilibrium acting in known directions ; and since the magnitude of w is known , that of R and P can be found by the ...
Страница 63
... right angles to CE ; if T is the ten- sion of the rope , and w the weight of the block which can be found to equal 18,388 lbs .; then the moments of T and w are respectively ANXT and AM x 18,388 ; and the prin- ciple of moments assures ...
... right angles to CE ; if T is the ten- sion of the rope , and w the weight of the block which can be found to equal 18,388 lbs .; then the moments of T and w are respectively ANXT and AM x 18,388 ; and the prin- ciple of moments assures ...
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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