From the foregoing rules, it is se may be transferred from one side o other by performing the opposite o to which it is changed. That is, is changed to subtraction on the o multiplication on one side is chang other and vice versa. ng each side of the equation s seen that any quantity de of the equation to the te operation on the side is, addition on one side he other and vice versa; anged to division on the IS e for a. e for b. rx. where N and n are the pulleys in revolutions diameters in inches problems: 30. Given, the diameter N as 40 r.p.m., and the sp the diameter of the small 31. What will be the spe nected to a 62-in. pulley ma The indicated horse by the following form 38. If the value of h.p. per cylinde A = 530.93, and L = 2 ft. 6 in., what would required? 39. Form the algebraic equation and so the cylinder required to develop 1140 h. average steam pressure of 150 lb. per sq. in is 2 ft. and the engine runs at a speed of algebraic equation for the diameter d befo substituting). 40. If a train travels E hr. at the rat the distance traveled. 41. If a train travels M hr. at the rate hr. at the rate of D miles per hr., wh traveled? 42. A train travels Chr. without sto complete a run of 10 hr. What is the va formula.) 43. What is the circumference in in diam.? 44. How many revolutions will a whe in going 1 mile? What would this be for 45. What are the r.p.m. of a driver w when the locomotive is running at a spee 47. Rearrange the formula in Prob. 4 for D. Ans. 1 48. What diameter of drivers is nece at 300 when running at the rate of 70 m. 62 m.p.h.? 52. Referring to the form what is the horsepower dev m.p.h., using 164 lb. as Wheels = 80 in., cylinder 53. What would be the 60 m.p.h. if we used 145 lb place of 164 lb., the cylind the preceding question? 54. What is the horsepo at a speed of 10 m.p.h., u pressure? Wheels = 80 in. sure 205 lb. per sq. in. 55. What is the horsepo at 10 m.p.h.? Drivers boiler pressure 205 lb., A = = y t = Time in sec. 58. How long will it take an object to height of 350 ft.? 59. The height of a building is 720 ft. a baseball to hit the ground if it were drop building? The rule for finding the velocity rim of a wheel or pulley is express 60. Find the velocity of the rim of a f making 90 r.p.m. 61. The rim of a pulley has a veloc What is its diameter if it makes 320 r. p. 62. Good practice says that the velo wheel should not exceed 5280 ft. per mi the greatest allowable speed in r.p.m. of a The rule for finding the width of mit a given horsepower is as follows in which W is the width of the belt power transmitted; P, the allowabl |