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Concept explainers
A small trailer and its load have a total mass of 250 kg. The trailer is supported by two springs, and when the boat is given an initial displacement x0 downward and released from rest, the amplitude of oscillation is reduced to ¼ x0 after one half cycle and the period of the oscillation is 0.8 s. The trailer is then pulled over a road, the surface of which can be approximated by a sine curve with an amplitude of 35 mm and a wavelength of 5 m (i.e., the distance between successive crests is 5 m and the vertical distance from crest to trough is 70 mm). Determine (a) the damping ratio, (b) the spring stiffness, (c) the amplitude of the vibration of the trailer at a speed of 50 km/h. (Hint: Use the logarithmic decrement discussed in Probs. 19.129 and 19.130.)
Fig. P19.162
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Chapter 19 Solutions
Loose Leaf for Vector Mechanics for Engineers: Statics and Dynamics
- a problem existed at the stocking stations of a mini-load AS/RS (automated storage and retrieval system) of a leading electronics manufacturer (Fig.1). At these stations, operators fill the bin delivered by the crane with material arriving in a tote over a roller conveyor. The conveyor was designed at such a height that it was impossible to reach the hooks comfortably even with the tote extended. Furthermore, cost consideration came into the picture and the conveyor height was not reduced. Instead, a step stool was considered to enable the stocker to reach the moving hooks comfortably. The height of the hooks from the floor is 280.2 cm (AD). The tote length is 54.9 cm. The projection of tote length and arm reach, CB = 66.1 cm. a) What anthropometric design principles would you follow to respectively calculate height, length, and width of the step to make it usable to a large number of people? b) What is the minimum height (EF) of the step with no shoe allowance? c) What is the minimum…arrow_forwardQu. 5 Composite materials are becoming more widely used in aircraft industry due to their high strength, low weight and excellent corrosion resistant properties. As an engineer who is given task to design the I beam section of an aircraft (see Figure 7) please, answer the following questions given the material properties in Table 3. Determine the Moduli of Elasticity of Carbon/Epoxy, Aramid/Epoxy, and Boron /Epoxy composites in the longitudinal direction, given that the composites consist of 25 vol% epoxy and 75 vol% fiber. What are the specific moduli of each of these composites? What are the specific strengths (i.e. specific UTS) of each of these composites? What is the final cost of each of these composites?please show all work step by step problems make sure to see formula material sciencearrow_forwardMueh Battery operated train Coll 160,000kg 0.0005 0.15 5m² 1.2kg/m³ CD Af Pair 19 пре neng 0.98 0.9 0.88 Tesla Prated Tesla Trated "wheel ng Joxle 270 kW 440NM 0,45m 20 8.5kg m2 the middle Consider a drive cycle of a 500km trip with 3 stops in Other than the acceleration and deceleration associated with the three stops, the tran maintains constat cruise speed velocity of 324 km/hr. The tran will fast charge at each stop for 15 min at a rate Peharge = 350 kW ΟΙ 15MIN Stop w charging (350kW) (ผม τ (AN GMIJ t 6M 1) HOW MUCH DISTANCE dace is covered DURING THE ACCELERATION TO 324 km/hr? 2) DETERMINE HOW LONG (IN seconds) the tran will BE TRAVELING AT FULL SPEED 2 ? 3) CALCULATE THE NET ENERGY GAW PER STOP etearrow_forward
- Please stop screenshoting ai solution,it always in accurate solve normalarrow_forwardResearch and select any different values for the Ratio of connecting rod length to crank radius from various engine models, then analyze how these changes affect instantaneous velocity and acceleration, presenting your findings visually using graphs.arrow_forwardPb 9) 4.44 bas gnibus& WX 002 grillimatul fred bail (e) For the simply supported I-beam, a load of 1000 lb in center. Find the maximum transverse shear stress. Compare your answer with the approximation obtained by dividing the shear load by the area of the web only with the web considered to extend for the full 8-in depth. - 3½ in. 12 bas in 0% to tolerabib tormi no grived in. 8 in. 38 in. 12 ½ in.arrow_forward
- Pb 12) 4.61 Draw the Mohr circle for the stresses experienced by the surface of an internally pressurized steel tube that is subject to the tangential and axial stresses in the outer surface of 45 ksi and 30 ksi, respectively, and a torsional stress of 18 ksi. yx 18 45 30arrow_forwardPb 8) 4.39 For the C-clamp shown, what force F can be exerted by the screw if the maximum tensile stress in the clamp is to be limited to 30 ksi? F 2 in. სის 3436 16 13 blos 0101 alos12 nodus 121A (s 3 in. in. 16 in. 16 web leonas OFF elson yollA (d 016 (& d of bolow-bloo ai 15912 020112LA sue) vilisub 22 bal.90 Swman a bris ctxibasqqA) laste is tools?arrow_forwardQuiz/An eccentrically loaded bracket is welded to the support as shown in Figure below. The load is static. The weld size for weld w1 is h1 = 6mm, for w2 h2 = 5mm, and for w3 is h3 =5.5 mm. Determine the safety factor (S.f) for the welds. F=22 kN. Use an AWS Electrode type (E90xx). 140 S Find the centroid I want university professor solutions O REDMI NOTE 8 PRO CAI QUAD CAMERA 101.15 Farrow_forward
- Pb 6) 4.31 do = 25 mm 4.31 What bending moment is required to produce a maximum normal stress of 400 MPa: (a) In a straight round rod of 40-mm diameter? (b) In a straight square rod, 40 mm on a side (with bending about the X axis as shown for a rectangular section in Appendix B-2)?arrow_forwardPb 13) 4.73 Find the maximum value of stress at the hole and semicircular notch. 45000 N 50 mm 100 mm 15 mm 25 mm 45000 Narrow_forwardPb 11) 4.53 Consider the 1-in solid round shaft supported by self-aligning bearings at A and B. Attached to the shaft are two chain sprockets that are loaded as shown. Treat this as a static loading problem and identify the specific shat location subjected to the most severe state of stress and make a Mohr circle representation of this stress state. 1-in.-dia. shaft 500 lb 2 in. 1000 lb 3 in. 3 in.arrow_forward
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