By Russell C. Hibbeler

Engineering Mechanics: mixed Statics & Dynamics, 12th variation is perfect for civil and mechanical engineering pros. In his massive revision of Engineering Mechanics, R.C. Hibbeler empowers scholars to reach the entire studying event. Hibbeler achieves this via calling on his daily lecture room event and his wisdom of ways scholars study inside and out of lecture.

as well as over 50% new homework difficulties, the 12th variation introduces the hot parts of Conceptual difficulties, basic difficulties and MasteringEngineering, the main technologically complex on-line educational and homework procedure.

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**Extra info for Engineering Mechanics: Combined Statics & Dynamics (12th Edition)**

**Sample text**

Part (c) 45(106 N)3 45 MN 3 = 900 Gg 900(106) kg = 50(109) N 3>kg = 50(109) N 3 a = 50 kN 3>kg 1 kN 3 1 b 103 N kg Ans. PROBLEMS 15 PROBLEMS 1 1–1. 578 s, (c) 4555 N, and (d) 2768 kg. *1–12. ) of brass is 520 lb>ft3. ) in SI units. Use an appropriate prefix. 1–2. Represent each of the following combinations of units in the correct SI form using an appropriate prefix: (a) mMN, (b) N>mm, (c) MN>ks2, and (d) kN>ms. 1–13. Convert each of the following to three significant figures: (a) 20 lb # ft to N # m, (b) 450 lb>ft3 to kN>m3, and (c) 15 ft> h to mm> s.

To do this, each force is first resolved into its x and y components, and then the respective components are added using scalar algebra since they are collinear. The resultant force is then formed by adding the resultant components using the parallelogram law. For example, consider the three concurrent forces in Fig. 2–17a, which have x and y components shown in Fig. 2–17b. , F1 = F1x i + F1y j F2 = - F2x i + F2y j F3 = F3x i - F3y j y F2 F1 x The vector resultant is therefore FR = = = = F3 F1 + F2 + F3 (a) F1xi + F1y j - F2x i + F2y j + F3x i- F3y j (F1x - F2x + F3x) i + (F1y + F2y - F3y) j (FRx)i + (FRy)j y F2y If scalar notation is used, then we have + ) (: (+ c) F1y F2x FRx = F1x - F2x + F3x FRy = F1y + F2y - F3y F1x F3x F3y These are the same results as the i and j components of FR determined above.

2–26/27 *2–28. The beam is to be hoisted using two chains. Determine the magnitudes of forces FA and FB acting on each chain in order to develop a resultant force of 600 N directed along the positive y axis. Set u = 45°. •2–29. The beam is to be hoisted using two chains. If the resultant force is to be 600 N directed along the positive y axis, determine the magnitudes of forces FA and FB acting on each chain and the angle u of FB so that the magnitude of FB is a minimum. FA acts at 30° from the y axis, as shown.