Calendar: 1880-1881 Page 685

CLOTHWORKERs' SCIENCE EXHIBITIONS 685 Three forces act on body and keep it at rest The angle between the first and second is 90 and between the second and third 150 the first is lbs Employ the Triangle of Forces to find the magnitudes of the other forces weight of cwt is hung by two ropes from two hooks in horizontal beam 12 feet above the weight and distant respectively feet and feet from the point vertically above the weight Find the tension of each rope Show how to resolve force in two directions at right angles to one another Forces of and UOlbs make angles of 30 45 90 and 120 with fixed straight line find the magnitude and direction of the resultant Find the centre of gravity of 3d £d 6d Is 2s 2s 6d and 5s all in silver placed in order in straight line ft apart The arms of bent lever are at right angles One arm V3 feet long has weight of lbs Determine the angular position of the lever when in equilibrium Find the centre of gravity of plank of uniform thick- ness 14 ft long in broad at one end and in broad at the other What is meant by the acceleration due to force and upon what does its value depend body acted on by uniformly accelerating force moves through feet while its velocity increases from 12 feet per second to 13 per second Find the acceleration indicating the course of the reasoning upon which your calculation is based 10 body is thrown up an inclined plane of which the height is equal to the base with velocity of 10 feet per second which is just sufficient to carry it to the top of the plane it then falls vertically what time will have elapsed and what velocity will the body have acquired when it reaches the horizontal plane from which it started