Concept explainers
The lug nut on the wheel of the automobile is to be removed using the wrench and applying the vertical force of F = 30 N at A. Determine if this force is adequate, provided 14 N · m of torque about the x axis is initially required to turn the nut. If the 30-N force can be applied at A in any other direction, will it be possible to turn the nut?
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Chapter 4 Solutions
INTERNATIONAL EDITION---Engineering Mechanics: Statics, 14th edition (SI unit)
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- Determine the n- and t-components of the force F which is exerted by the rod AB on the crank OA. Evaluate your general expression for F = 90 N and (a) 0 = 29°, 3= 25° and (b) = 14°, 3 = 37° Answers: (a) Fn = (b) Fn = i i B BI A N, Ft= N, Ft= i N Narrow_forwardThe device shown is a part of an automobile seat-back-release mechanism. The part is subjected to the 3.9-N force exerted at A and a 270-N-mm restoring moment exerted by a hidden torsional spring. Determine the y-intercept of the line of action of the single equivalent force. Your answer will be positive if the intercept is above O and negative if below O.arrow_forwardDetermine the n- and t-components of the force F which is exerted by the rod AB on the crank OA. Evaluate your general expression for F-101 N and (a) = 29°, -21° and (b) 0 -25°, 3 - 36° B Answers: (a) F= N (b) Fn- N i i N, F₂ i N. F iarrow_forward
- The friction at sleeve A can provide a maximum resisting moment of 380 Nm about the x-axis. Determine the largest magnitude of force F that can be applied to the bracket so that the bracket will not rotate about the x-axis. Given that L1 is 275 mm, L2 is 171 mm and L3 is 126 mm. Z F 60° X L1 mm A B 45° 60° L3 mm L2 mm yarrow_forward5. The pumping unit is used to recover oil. When the walking beam ABC is horizontal, the force acting in the wireline at the well head is 250 lb. Determine the torque M which must be exerted by the motor in order to overcome this load. The horse-head C weighs 60 lb and has a center of gravity at Gc. The walking beam ABC has a weight of 130 lb and a center of gravity at Gs, and the counterweight has a weight of 200 lb and a center of gravity at Gw. The pitman, AD, is pin connected at its ends and has negligible weight. -5 ft -6 ft !GB B 70° 20° 250 Ib 3 ft 2.5 ftarrow_forward3-13. The torque wrench ABC is used to measure the moment or torque applied to a bolt when the bolt is located at A and a force is applied to the handle at C. The mechanic reads the torque on the scale at B. If an extension AO of length d is used on the wrench, determine the required scale reading if the desired torque on the bolt at O is to be M. мarrow_forward
- The pumping unit is used to recover oil. When the walking beam ABC is horizontal, the forceacting in the wireline at the well head is 250 lb. Determine the torque M which must beexerted by the motor in order to overcome this load. The horse-head C weighs 60 lb andhas a center of gravity at Gc. The walking beam ABC has a weight of 130 lb and a centerof gravity at GB, and the counterweight has a weight of 200 lb and a center of gravity atGW. The pitman, AD, is pin connected at its ends and has negligible weight.arrow_forwardQ3arrow_forwardThe cable AB prevents bar OA from rotating clockwise about the pivot O. If the cable tension is 820 N, determine the n- and t- components of this force acting on point A of the bar. 2.0 m B Answers: Tn= i Tt= i Attempts: 0 of 4 used Submit Answer -1.5 m Save for Later 63⁰ Z Z N Narrow_forward
- 2/33 A prybar is used to remove a nail as shown. De- termine the moment of the 240-N force about the point O of contact between the prybar and the small support block. P-30 N 16 m 240 N 16 m 15 350 mm PROBLEM 2/3s 2/36 A man exerts a force F on the handle of the stationary wheelbarrow at A. The weight of the wheelbarrow along with its load of dirt is 185 Ib with center of gravity at G. For the configuration shown, what force F must the man apply at A to make the net moment about the tire contact point B equal to zero? 65 30 mm PROBLEM 2/33 Representative Problems 2/34 An overhead view of a door is shown. If the com- 20 pressive force F acting in the coupler arm of the hy- draulic door closer is 17 lb with the orientation shown, determine the moment of this force about the hinge axin O. 20 PROBLEM 2/36 2/37 A 150-N pull T in applied to a cord, which is wound securely around the inner hub of the drum. Determine the moment of T about the drum center C. At what angle e should T be applied…arrow_forwardThe shaft-and-pulley assembly ABCD is driven by the torque (couple) suppliedby the electric motor at A. The assembly is also subjected to the two belt tensionsshown at each of the two pulleys. Determine the force-couple system at D that isequivalent to the torque and the four belt tensions.arrow_forward4-151. Currently eighty-five percent of all neck injuries are caused by rear-end car collisions To alleviate this problem, an automobile seat restraint has been developed that provides additional pressure contact with the cranium. During dynamic tests the distribution of load on the cranium has been plotted and shown to be parabolic. Determine the equivalent resultant force and its location, measured from point A. 12 lb t 0.5 t w = 12(1 + 2r") Ib/t 18 lb/m Solution: P Type here to search 1:01:44 / 1:15:39arrow_forward
- International Edition---engineering Mechanics: St...Mechanical EngineeringISBN:9781305501607Author:Andrew Pytel And Jaan KiusalaasPublisher:CENGAGE L