CXVl 
Agricultural Education : 
EXAMINATIOX Ds MECHANICS AND XATUEAL 
PHILOSOPHY. 
MAXEarmi NinoEE of Maeks, 200. Pass Nximbee, 100. 
Thursday, April 20th, from 10 a.m. till 1p.m. 
1. In wliat tkree states is matter known to exist ? What are the 
characteristic properties of matter in these states severally as regards 
the transmission of force ? 
2. What is the centre of gravity of a body '? Where is the centre 
of gravity of a triangular board situated ? If such a board be divided 
by a line bisecting two of its sides, where will the centres of gravity 
of its two parts be situated ? 
3. What is meant by the moment of a force with respect to a point ? 
What general relation exists between the moments of two forces and 
their resultant all taken with respect to any one point in the plane in 
which they act ? 
4. A rod capable of turning round a hinge rests with one end 
against a smooth vertical wall ; explain how to find the pressures on 
the wall and on the hinge, and find the pressures in the following 
case : — the rod is of uniform density, weighs 10 lbs., and is inclined 
to the vertical at an angle of 60^. 
5. What is meant by the sensibility of a balance ? Other things 
being the same, the sensibility is greater as the weight of the beam is 
less — Why is it so ? 
6. If a body is thrown vertically upwards, why would it return to 
the hand with a velocity equal to the velocity of projection, were it 
not for the resistance of the air ? 
If a body is thrown upwards with a velocity of 48 feet a second, for 
how long is it at a greater altitude than 20 feet above the point of 
projection (g = 32) ? 
7. Explain the use of a fly-wheel in an ordinary steam-engine. A 
steam-engine makes 20 strokes of 6 feet a minute, under an average 
steam-pressure of 15 lbs. per square inch, the area of the piston being 
1000 square inches. Its fly-wheel makes 10 revolutions a minute, 
and has a radius of 10 ft., what must be its weight, if it have accumu- 
lated in it as much work as is done by the steam in one stroke of the 
engine ? 
8. Describe briefly a method of finding the specific gravity of a 
liquid by the balance. 
A glass ball weighs 700 grains in air, 4840 grains in water, and 
5080 grains in spirits ; find the specific gravity of the spirits. 
9. What is meant by the boiling- and freezing-points of a thcmo- 
meter ? In what sense can the boiling-point be spoken of as a fixed 
point ? 
On the top of a mountain water boils at 85' C, what is this called 
on Fahrenheit's scale ? 
