38 THE VETERINARY PROFESSION 



rests in a horizontal position on a small support. Find how 

 far the support is from the end to which the 8 lb. weight is 

 attached. 



3. Find the centre of gravity of a uniform wire which is bent 

 in such a way that it forms AB, BC^ CD, three sides of a 

 square. 



4. Give, with reasons, one example of each of the three 

 classes of Lever. 



Define mechanical advantage. What is the mechanical 

 advantage of a Wheel and Axle ? 



5. Two particles started from rest at the same instant, and 

 moved in straight lines at right angles to one another, one with 

 uniform velocity, the other with uniform acceleration, the 

 measures of the velocity and acceleration with foot-second 

 units being 23 and 7 respectively. Initially the particles were 

 close together; how far apart (to the nearest foot) were they 

 when they had been moving for 6 seconds ? 



6. Enunciate Newton's Laws of Motion. 



A constant force acted in the direction of motion of 

 mass of 9 lbs. for 15 seconds. The effect of the force 

 was to change the velocity of the mass from 100 feet per 

 second to 200 feet per second. What was the magnitude 

 of the force ? 



7. A particle was projected vertically upwards with a velocity 

 of 365 feet per second. As it ascended, at what height above 

 the point of projection was its velocity 189 feet per second, 

 and how long did it take to reach that height ? 



8. Define specific gravity. 



Two cubic inches of a metal weigh 9 oz., and a cubic 

 foot of water weighs 1000 oz. Find, correct to one 

 decimal place, the specific gravity of the metal. 



9. State the conditions of equilibrium of a body floating 

 freely in a liquid. 



A rectangular log of wood of square section floats in 



water with 2 inches of its thickness above the surface. 



The S.G. of the wood being .75, what is the area of its 



section ? 



10. Describe, and explain the action of, the Forcing Pump. 



