By Clifford Newton. Mills

ISBN-10: 1152039687

ISBN-13: 9781152039681

Writer: ny, D. Van Nostrand corporation book date: 1916 matters: Mechanics Notes: this is often an OCR reprint. there's typos or lacking textual content. There aren't any illustrations or indexes. for those who purchase the overall Books version of this booklet you get loose trial entry to Million-Books.com the place you could choose between greater than one million books at no cost. you can even preview the booklet there.

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The maximum number of people who can The length ride on the stairway at any one time is 120. of the stairway is 50 feet, and its vertical rise is 30 feet. Neglecting friction and assuming that the average weight of one person is 150 pounds, what is the maxi(a) mum power required to operate the stairway? the efficiency of the system is 60 per cent, what maximum power 35. work. and (b) is If the required? Energy is defined as the capacity for doing There are two kinds of energy, called potential kinetic.

Find the initial velocity of the cannon. 2. A bullet weighing i ounce is fired from a gun which weighs 10 pounds. The velocity of the bullet is 1000 Find (i) the initial velocity of the feet per second. gun, (2) the time of recoil, and (3) the space travelled by the gun, if the recoil is overcome by a time average force of 10 lbs. 3. A cannon weighing a tons fires a 1000-pound shell with a velocity of 1000 feet per second. The cannon recoiled with an initial velocity of 20 feet per second. What is 4.

16. Addition and Subtraction of a p To Vectors. p' find s Vector Diagram Space Diagram Fig. 5. the sum of two vectors p and q (Fig. 5) draw ah equal and from the end h draw he equal in to vector ^, length and parallel to vector q\ join ac. Then ac the geometric or vector sum of the vectors p and We may write is q. the equation vector />+ vector g = vector r, . . (29) or p-^q=r The value the point duced. c of r may (30) be calculated as follows: from drop a perpendicular cd upon ah pro- Hence ac^ r^ = a(P-\-dc'^, or = p^+q^+2pq '?

### A Short Course in Elementary Mechanics for Engineers by Clifford Newton. Mills

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