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 الكتب الكتب 1 - 8 من 8 فيA projectile is to be thrown across a plain 120 feet wide, to strike a mark 30 feet....
A projectile is to be thrown across a plain 120 feet wide, to strike a mark 30 feet high, the velocity of projection being that acquired down 80 feet j find at what angle it must be projected.
Cambridge Problems: Being a Collection of the Printed Questions Proposed to ... - الصفحة 210
1821 - عدد الصفحات: 425
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## New series of The mathematical repository, المجلد 5

Thomas Leybourn - 1830
...a Sr(e4-e) = ¿| 2 (X + y) = С гс3 — 6х — 4° — °» by Cardan's method. 3ïr.23l = ю» 4. A beam rests with one end on a horizontal plane,...necessary to prevent its lower end from sliding outwards. g. A projectile is to be thrown across a plain 120 feet wide, to strike a mark 30 feet high, the veloutv...
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## A Collection of Cambridge Mathematical Examination Papers: Papers in the ...

...kind ; what is the probability of taking one of each sort, if four be taken out at once ? 11. A given beam rests with one end on a horizontal plane, and the other on the convex surface of a hemisphere, whose centre is in the plane ; determine the magnitude of the...
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## The American Statistical Arithmetic: Designed for Academies and Schools

Francis Henney Smith - 1845 - عدد الصفحات: 276
...horizontal range. Here « = 45°, » = 50, .'. when y = o 2500 A1 — - . g Ex. 3, A prqieftilp is thrown across a plain 120 feet wide, to strike a mark...the velocity of projection being that acquired down SO feet ; required the / of projection. •-'15 M 1 Here y - 30, x = 120, e8 = 160 g, .'. 1=4 tan....
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## Theoretical and Practical Mechanics: Designed Principally for Practical Men

James Hann - 1848 - عدد الصفحات: 325
...upon a plane, cotan. incidence : cotan. reflection : : force of compression : force of elasticity. 18. A projectile is to be thrown across a plain 120 feet...velocity of projection being that acquired down 80 feet. Find at what angle it must be projected. 19. A ball is projected from a given point in the horizontal...
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## Elements of Dynamics (kinetics and Statics): With Numerous Exercises. A Text ...

John Lovell Robinson - 1888 - عدد الصفحات: 348
...weight will draw the body up the plane. Example iv. — A ladder, whose CG is at its middle point, rests with one end on a horizontal plane, and the other against a vertical wall, to which it is inclined at an angle of 45°. The coefficient of friction for the lower end =J, and...
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## A Treatise on Analytical Statics: The parallelogram of forces. Forces acting ...

Edward John Routh - 1891
...contact with the smooth hemisphere is equal to (o ~ 6)//2. [St John's Coll., 1885.] Ex. 4. A heavy rod rests with one end on a horizontal plane and the other against a vertical wall. To a point in the rod one end of a string is tied, the other end being fastened to a point in the line...
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## A Treatise on Analytical Statics: The parallelogram of forces. Forces acting ...

Edward John Routh - 1896
...contact with the smooth hemisphere is equal to (a ~ h)/n. [St John's Coll., 1885.] Ex. 4. A heavy rod rests with one end on a horizontal plane and the other against a vertical wall. To a point in the rod one end of a string is tied, the other end being fastened to a point in the line...
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## Annual Report of the Commissioners ..., المجلد 63

1897
...weight of the rod being 40 Ibs. 10 marks. 3. A ladder, whos4 centre of gravity is at its middle point, rests with one end on a horizontal plane and the other against a vertical wall, to which it is inclined at an angle of 45°. The coefficient of friction for the lower end is |, and...
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