Engineering Mechanics

Chapter 11 : Simple Lifting Machines „„„„„ 209 distance of 2x + x = 3x = (2^2 – 1)x. Similarly, in order to keep the relative po ...

(^210) „„„„„ A Textbook of Engineering Mechanics Fig. 11.14. Simple screw jack. Fig. 11.14. shows a simple screw jack, which is ...

Chapter 11 : Simple Lifting Machines „„„„„ 211 We know that velocity ratio 2 2 400 V.R. 251.3 10 l p ππ× == = and 2000 M.A. W PP ...

(^212) „„„„„ A Textbook of Engineering Mechanics W= Load lifted, and P= Effort applied, at the end of the lever to lift the load ...

Chapter 11 : Simple Lifting Machines „„„„„ 213 11.17. WORM GEARED SCREW JACK It is a further improved form of differential screw ...

(^214) „„„„„ A Textbook of Engineering Mechanics In general, if the worm wheel is n threaded, then 2 V.R. lT np π = Example 11 ...

Chapter 11 : Simple Lifting Machines „„„„„ 215 QUESTIONS Distinguish clearly between a ‘simple wheel and axle’ and a ‘different ...

(^216) „„„„„ A Textbook of Engineering Mechanics The velocity ratio of a first system of pulleys with 4 pulleys is (a) 4 (b) 8 ...

Chapter 12 : Support Reactions „„„„„ 217 217 Support Reactions 12.1. INTRODUCTION In our day-to-day work, we see that whenever w ...

(^218) „„„„„ A Textbook of Engineering Mechanics see that the total weight of the fan and girder is acting through the supports ...

Chapter 12 : Support Reactions „„„„„ 219 * It will also be discussed in Art. 12.12 Sometimes, the load varies from zero at one s ...

(^220) „„„„„ A Textbook of Engineering Mechanics 12.8.GRAPHICAL METHOD FOR THE REACTIONS OF A BEAM It is a systematic, but long ...

Chapter 12 : Support Reactions „„„„„ 221 Fig. 12.6. Simply supported beam 12.12. SIMPLY SUPPORTED BEAMS It is a theoretical case ...

(^222) „„„„„ A Textbook of Engineering Mechanics and sum* of the clockwise moments about A = (4 × 1.5) + (2 × 1.5) 2.25 + (1.5 × ...

Chapter 12 : Support Reactions „„„„„ 223 * It means converting the uniformly distributed load between C and D as well as triangu ...

(^224) „„„„„ A Textbook of Engineering Mechanics Example 12.5. A beam AB of span 3m, overhanging on both sides is loaded as show ...

Chapter 12 : Support Reactions „„„„„ 225 Since the reactions RC and RD are equal, therefore reaction at support 11 5.5 kN 2 == W ...

(^226) „„„„„ A Textbook of Engineering Mechanics A beam AB 6 m long rests on two supports 4 m apart, the right hand end is over ...

Chapter 12 : Support Reactions „„„„„ 227 12.15. HINGED BEAMS In such a case, the end of a beam is hinged to the support as shown ...

(^228) „„„„„ A Textbook of Engineering Mechanics We know that vertical component of the reaction RA = [5 + (1.5 × 2) + 2.83] – 5 ...