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- Draw the FBD of the entire frame, assuming that friction and the weights of the members are negligible. How many unknowns appear on this FBD?The figure shows a steel bar being processed by a rolling mill. Given that P=80kN and r =0.016, determine the force F required to advance the bar at a constant speed.Two blocks respectively A weighs 1600N and B weighs 2400N areconnected by a spring both rests on an inclined plane upward to theright at a slope of 3 vertical to 4 horizontal. Their motion is downto the incline and resisted by a force P = 800N. Their coefficient of friction is 0.30 under A and 0.10 under B. Compute the force in thespring.a. 636.3 Nb. 663.3 Nc. 633.6 Nd. 366.3 N
- a 46 l Asiacell B/s DRAW F. B. DAND SHOWTHE DIRECTION OF FRICTION FORCE 40 kN 60 kN VEMATHalino.com9.27 The ladder and the person weigh 37lb and 200lb, respec- tively. The center of mass of the 12-ft ladder is at its midpoint. The angle a 24°. Assume that the wall exerts a negligible fric- tion force on the ladder. (a) If x = 4 ft, what is the magnitude of the friction force exerted on the ladder by the floor? (b) What minimum coefficient of static friction between the lad- der and the floor is necessary for the person to be able to climb to the top of the ladder without slipping? Problems 9.27-9.29 a-4) Block B weighing 500 N rests on block A which weighs 300 N. The dynamic coefficient of friction be- tween contact surfaces is 0.4. At wall C there are rollers whose friction we can neglect. What is the ac- celeration of body A when a force F of 5000 N is ap- plied? F De gem B A 20°
- A 100-lb uniform beam 16 ft long lies against a cor- Determine the maximum force ner as shown in Fig. P for which the beam will be in equilibrium if the coeffi- cient of friction 4s is 0.75 at the bottom surface and 0.40 at the corner sur- face. 16 ft 4 ft 8 ftA uniform belt 36 in. long and weighing 1 lb hangs over a small fixed peg as shown in Fig. ficient of friction between the belt and the peg is 0.40, de- termine the maximum distance d between the two ends for If the coef- which the belt will not slip off the peg.While digging a small hole prior to planting a tree, a homeowner encounters rocks. If he exerts a horizontal 242-N force on the prybar as shown, what is the horizontal force exerted on rock C? Note that a small ledge on rock C supports a vertical force reaction there. Neglect friction at B. Complete solutions (a) including and (b) excluding the weight of the 17-kg prybar. 242 N A, 1750 mm 15 B 220 mm Answers: (a) Including weight, Fc = i N (a) Excluding weight, Fc = i N
- 13 cm 50 cm 2. The disk weighs 220 N and the bar weighs 110 N. The coefficients of friction between the disk and theWhile digging a small hole prior to planting a tree, a homeowner encounters rocks. If he exerts a horizontal 199-N force on the prybar as shown, what is the horizontal force exerted on rock C? Note that a small ledge on rock C supports a vertical force reaction there. Neglect friction at B. Complete solutions (a) including and (b) excluding the weight of the 23-kg prybar. 199 N 1260 mm 21 190 mm Answers: (a) Including weight, Fc = i N (a) Excluding weight, Fc = i Npoint B. Problem 4.9 Figure 4.56 illustrates a person who is trying to pull a block on a horizontal surface using a rope. The rope makes an angle 0 with the horizontal. If W is the weight of the block and u is the coefficient of maximum Answer: T Determ force at pe friction between the bottom surface of the block and horizontal surface, show that the magnitude P of minimum force the person must apply in order to overcome the frictional and gravitational effects (to start moving the block) is P 3= cos e+ u sin 0 Fig. 4.58 Probl Fig. 4.56 Problem 4.9 Problem 4. 12 beam hinged to is / 4.5 m and Type here to search