Agricultural Education — Examination Papers, 1887, xxiii 
accelerated, and if at the end of the first second of its motion its 
velocity is 7 ft. a second, and at the end of the second second its 
velocity is 10 ft. a second, what ^^•ill be its velocity at the end of 
the 10th second of its motion ? 
6. A force can just support a mass of 5 oz. against gravity ; if 
that force were applied to a body of 4 lbs. perfectly free to move 
(for instance, if the force were applied horizontally to the body 
placed on a smooth horizontal table), what distance would it make 
the body describe from rest in the first three seconds of its motion 
(^ = 32)? 
7. A cork is tied by a fine thread to the bottom of a vessel ; 
water is poured in, and the vessel filled to such a depth that the 
thread keeps the cork from rising to the surface ; explain why the 
thread will be in a vertical line, when the water and cork come to 
rest. 
8. State Boyle's Law. A quantity of air, under a pressure of 
3 atmospheres, has a volume of H cubic feet ; what "svdll be its 
volume if the pressure is reduced to 2\ atmospheres ? What is 
meant by a pressure of one atmosphere ? 
9. What is latent heat ? Mention any circiunstances under 
which heat becomes latent. 
10. The area of a piston of a steam-engine is 2,000 square inches ; 
the length of the stroke is 6 ft. ; the mean pressure of the steam is 
22 lbs. per square inch ; the piston makes 10 strokes a minute ; 
what is the horse-power of the engine ? If this engine overcame at 
the working point a constant resistance of 1,000 lbs., what would be 
the velocity of the working point 1 What supposition is tacitly 
made in your answer ? 
D. MENSURATION AND LAND SURVEYING. 
Noveinber 9, 1887. 
{Two hours allowed.) 
1. ABC is a triangle, whose area is 145,000 sq. ft. ; the base 
A B is 575 ft. long ; and the angle A is one of 67° 30' ; draw the 
triangle to a scale of 100 ft. to an inch. Note the number of feet 
in the other sides, and the number of degrees in the other angles. 
