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22Oct2018

Leaving Certificate Examination 1953 Honours Applied Mathematics

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Question 1

The ends of a light inextensible string 5 feet long are attached to two pegs which are 4 feet apart and in the same horizontal line. A mass of 20 lb. is suspended from the string at a point which is 2 feet from one peg and 3 feet from the other. Find the tension in each part of the string.

Question 2

A block weighing 10 lb. can just rest without slipping on a rough plane when the plane is inclined at an angle of 40^\circ to the horizontal. Find

(a) the magnitude of the least force in the horizontal direction,

(b) the magnitude and direction of the least force, that will keep the block from slipping when the plane is inclined at an angle of 50^\circ to the horizontal.

Question 3

An engine weighing 50 tons is pulling a train of weight 150 tons down an incline of 1 in 80. The speed of the train is 30 m.p.h. and it is accelerating at the rate of \frac{1}{2} ft. per sec^2. If the frictional resistances to motion are equivalent to 10 lb. wt. per ton, find the horse-power at which the engine is working.

Question 4

A pile driver of mass 12 cwt. falls freely from rest through a distance of 9 feet and strikes a pile of mass 4 cwt. The pile driver and the pile move together as a single body after the impact and the pile is driven 6 inches into the ground. Find the average resistance of the ground, in tons weight.

Question 5

What is meant by the velocity of one body relative to another? Explain with the aid of a diagram how the velocity of A relative to B may be found if the velocities of A and B are known.

To a person on a ship travelling due East at 20 m.p.h., another ship two miles due South appears to be travelling at 8 m.p.h. in a direction 30^\circ West of North. Find the velocity of the second ship in magnitude and direction.

What is the distance between the ships when they are nearest to each other?

Question 6

If h if the greatest height reached by a projectile, prove that

    \[h=\frac{u^2\sin^2\alpha}{2h}=\frac{1}{8}gt^2\]

where u is the initial velocity, \alpha the angle of projection, and t the total time of flight.

Two vertical posts, each of height l feet, stand \frac{1}{2}l feet apart on a horizontal plane. A particle is projected from a point on the plane at an angle of \tan^{-1}3 with the horizontal, and just clears the top of each post. If H is the greatest height reached by the particle, and v

    its initial velocity, show that</span> <span style="color: #000000;"><span class="ql-right-eqno">   </span><span class="ql-left-eqno">   </span><img src="https://mathsgrinds.ie/wp-content/ql-cache/quicklatex.com-da5c2edd0b478e10a1d6ac72d0a9b3e1_l3.png" height="43" width="158" class="ql-img-displayed-equation " alt="\[H=\frac{9v^2}{20g}=l+\frac{5gl^2}{16v^2}\]" title="Rendered by QuickLaTeX.com"/></span> <span style="color: #000000;">and hence show that

v^2=\frac{5}{2}gl

    \[.</span> <h5><span style="color: #000000;">Question 7</span></h5> <span style="color: #000000;">A mass of $10$ ounces attached to a fixed point by a light inextensible string of length $2$ feet is describing a horizontal circle at the uniform rate of $60$ revolutions per minute. Find the radius of teh circle in feet and the tension in the string in lb. wt., correct to one place of decimals in each case.</span> <span style="color: #000000;">By how much is the tension increased if the speed is increased to $80$ revolutions per minute?</span> <h5><span style="color: #000000;">Question 8</span></h5> <span style="color: #000000;">Define Simple Harmonic Motion.</span> <span style="color: #000000;">A particle moves in a straight line so that is displacement, $c$, from a fixed point at any time, $t$, is given by the formula</span> <span style="color: #000000;">\]

x=a \sin \omega t – b \cos \omega t.

Show that the motion is Simple Harmonic, and find an expression for (i) the amplitude, (ii) the maximum velocity.

Find also an expression for the least time taken by the particle to travel a distance d from its mean position.

Question 9

A triangular lamina ABC is immersed in a vertical position in water with its vertex A at the surface and its base BC parallel to the surface. The base is 5 inches in length, and the height of the triangle is 3 inches. Find the total thrust of the water on ABC.

X, Y are two points on AB, AC respectively such that the straight line XY is horizontal. If the thrust on AXY is one-eight of the thrust on ABC, find the depth of XY below the surface.

[One cubic foot of water weight 62.5 lb.]

 


Citation:

State Examinations Commission (2018). State Examination Commission. Accessed at: https://www.examinations.ie/?l=en&mc=au&sc=ru

Malone, D and Murray, H. (2016). Archive of Maths State Exams Papers. Accessed at: http://archive.maths.nuim.ie/staff/dmalone/StateExamPapers/

Licence:

“Contains Irish Public Sector Information licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence”.

The EU Directive 2003/98/EC on the re-use of public sector information, its amendment EU Directive 2013/37/EC, its transposed Irish Statutory Instruments S.I. No. 279/2005, S.I No. 103/2008, and S.I. No. 525/2015, and related Circulars issued by the Department of Finance (Circular 32/05), and Department of Public Expenditure and Reform (Circular 16/15 and Circular 12/16).

Note. Circular 12/2016: Licence for Re-Use of Public Sector Information adopts CC-BY as the standard PSI licence, and notes that the open standard licence identified in this Circular supersedes PSI General Licence No: 2005/08/01.

Links:

https://circulars.gov.ie/pdf/circular/per/2016/12.pdf

https://creativecommons.org/licenses/by/4.0/legalcod

 

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