Calendar: 1879-1880 Page 628

628 APPLIED SCIENCE8 If Ρ and are two weights connected by fine thread whose weight is neglected passing over smooth fixed PQ cylinder show that the tension of the string p- wall of brickwork feet thick and 16 feet high forms part of one side of reservoir the water rising to height of 12 feet against the wall find the equation to the line of resistance and find where it cuts the base of the wall There is roof whose pitch is 30 the rafters are 40 feet long and the weight of each square foot of roofing is 15 lbs determine the horizontal thrust on the rafters and the direction of the resultant pressure on the supporting walls 10 If the framework supporting the roof in the last quee- tion be of the form given in the figure draw diagram of forces for the framework and determine the strains on the several pieces FIRST YEAR What is meant by mean velocity Show that the space described by falling body in any interval of time is equal to the mean velocity multiplied by the time The velocity of body is retarded regularly by feet per second and the body comes to rest in 10 seconds find the distance passed over by the body stone falls from the mouth of pit and seconds after another falls from point 600 feet lower down in the