Calendar: 1869-1870 Page 520

522 APPLIED SCIENCES Find the pressure on the surface of cube whose edge is inches when it is filled with alcohol of specific gravity 803 the pressure of cubic foot of water on its base being 000 oz Describe the phenomena that occur when lake whose temperature is 10 cools so that its surface becomes frozen when it returns to its original temperature fHtrljantta FIRST YEAR State and prove the Triangle and Polygon of Forces Give examples to show that it is sometimes convenient to take triangle whose sides are perpendicular to the directions of the forces From heavy plate whose shape is that of an equilateral triangle square is cut all the corners of which lie in the sides of the triangle Find the distance of the centre of gravity of the remainder from the vertex of the triangle when the length of the sides of the triangle is Explain the bent lever What weight can be raised verti- cally by lever bent at an angle of 150 whose arms are respec- tively and 60 inches long if power equal to 50 lbs be applied to the long arm in direction inclined at an angle of 30 to the vertical How is the centre of giavity of number of equal weights fastened at different points of weightless rod found Show that your reasoning may be applied to the case of simple heavy rod State the three laws of motion Give an example of each and show how the First and Third laws may be approximately proved by means of Attwood's machine body is projected upwards with velocity of 2576 feet per second and at the same instant another is let fall from the same spot when will they have passed over equal spaces How far has the second gone when the first reaches the ground again 322