cxlviii Agricultural Education — Examination Papers, 1879. 
7. Explain how cane-, grape-, and milk-sugar are related to one 
another, and to starch. Under what conditions is milk-sugar con- 
verted into lactic acid ? 
8. Give tests by which you can detect (1) copper nitrate, (2) sodium 
phosphate in a solution ; and explain the chemistry of your tests. 
9. Explain the causes of hardness of water; also which of them are 
curable, and by what means ? 
EXAMINATION IN MECHANICS AND NATURAL 
PHILOSOPHY. 
Maximum Number of Makes, 200. Pass Number, 100. 
Thursday, April 10th, from 10 a.m. till 1p.m. 
1. What is the momentum of a moving body ? 
If two bodies weigh 100 lbs. and 2 cwts. respectively, and the 
former is moving at the rate of 180 yards a minute, and the latter at 
the rate of 30 miles an hour ; what is the ratio of their momenta ? 
2. A particle placed on a smooth inclined plane is tied by a thread 
to a point near the top of the plane ; how is the pull of the particle 
on the thread found ? 
If the height and base of the plane are respectively 5 feet and 12 feet 
and the particle weighs 39 ounces ; what pull does it exert on the 
thread ? 
3. A and B are two points 12 feet apart, and so placed that the line 
adjoining them is inclined at an angle of 30° to the horizon ; a 
thread, 18 feet long, has its ends fastened to A and B ; a weight of 
200 lbs. is tied to the middle point of the thread ; find (by a construc- 
tion or otherwise) the tensions of the parts of the thread. 
4. What is the sensibility of a balance? 
Show that the sensibility is increased when the centre of gravity 
of the beam is brought nearer to the point of support. 
5. A mass of 20 lbs. is moving with a velocity of 40 feet a second ; 
what is its kinetic energy ? If its motion were resisted by a constant 
force equal to that of gravity on a pound of matter (g = 32), how far 
would it move before coming to rest ? 
6. What is the specific gravity of a substance ? 
Describe a specific gravity-bottle, and state how it is used for 
finding the specific gravity of a liquid. 
The weight of distilled water which a specific gravity-bottle will 
