Statics and Mechanics of Materials
2nd Edition
ISBN: 9780073398167
Author: Ferdinand P. Beer, E. Russell Johnston Jr., John T. DeWolf, David Mazurek
Publisher: McGraw-Hill Education
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Question
Chapter 4.4, Problem 90P
To determine
(a)
The smallest force
To determine
(b)
The smallest force
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4.0
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20.5
A₂ =
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28.3
434
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DE=2.9 ft
d Modis
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B
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Chapter 4 Solutions
Statics and Mechanics of Materials
Ch. 4.1 - For the beam and loading shown, determine (a) the...Ch. 4.1 - A 3200-lb forklift truck is used to lift a 1700-lb...Ch. 4.1 - A gardener uses a wheelbarrow to transport a 250-N...Ch. 4.1 - A load of lumber of weight W=25 kN is being raised...Ch. 4.1 - Three loads are applied as shown to a light beam...Ch. 4.1 - Three loads are applied as shown to a light beam...Ch. 4.1 - For the beam and loading shown, determine the...Ch. 4.1 - Prob. 8PCh. 4.1 - Prob. 9PCh. 4.1 - The lever BCD is hinged at C and attached to a...
Ch. 4.1 - The lever BCD is hinged at C and attached to a...Ch. 4.1 - A lever AB is hinged at C and attached to a...Ch. 4.1 - Determine the reactions at A and B when...Ch. 4.1 - Prob. 14PCh. 4.1 - Prob. 15PCh. 4.1 - Prob. 16PCh. 4.1 - A light bar AD is suspended from a cable BE and...Ch. 4.1 - Prob. 18PCh. 4.1 - Prob. 19PCh. 4.1 - Two slots have been cut in plate DEF, and the...Ch. 4.1 - A 6-m telephone pole weighing 1600 N is used to...Ch. 4.1 - Prob. 22PCh. 4.1 - For the and crate of Prob. 4.22 and assuming that...Ch. 4.1 - A tension of 20 N is maintained in a tape as it...Ch. 4.1 - The bracket ABC can be supported in the eight...Ch. 4.1 - Eight identical 500750-mm rectangular plates, each...Ch. 4.2 - Determine the reactions at B and C when a=30mm.Ch. 4.2 - Prob. 28PCh. 4.2 - A 12-ft wooden beam weighing 80 lb is supported by...Ch. 4.2 - Prob. 30PCh. 4.2 - One end of rod AB rests in the comer A and the...Ch. 4.2 - Using the method of Sec. 4.2B, solve Prob. 4.12.Ch. 4.2 - Prob. 33PCh. 4.2 - A 40-lb roller of 8-in. diameter, which is to be...Ch. 4.2 - Member ABC is supported by a pin and bracket at B...Ch. 4.2 - Prob. 36PCh. 4.2 - Prob. 37PCh. 4.2 - For the frame and loading shown, detennine the...Ch. 4.2 - For the boom and loading shown, determine (a) the...Ch. 4.2 - A slender rod BC of length L and weight W is held...Ch. 4.2 - Prob. 41PCh. 4.2 - Prob. 42PCh. 4.2 - Prob. 43PCh. 4.2 - Prob. 44PCh. 4.2 - Solve Prob. 4.44, assuming that the 170-N force...Ch. 4.2 - Prob. 46PCh. 4.2 - Prob. 47PCh. 4.2 - Prob. 48PCh. 4.2 - Prob. 49PCh. 4.2 - Prob. 50PCh. 4.3 - Two transmission belts pass over a double-sheaved...Ch. 4.3 - Solve Prob. 4.51, assuming that the pulley rotates...Ch. 4.3 - A 48-ft sheet of plywood weighing 40 lb has been...Ch. 4.3 - Prob. 54PCh. 4.3 - Prob. 55PCh. 4.3 - Prob. 56PCh. 4.3 - Prob. 57PCh. 4.3 - Prob. 58PCh. 4.3 - Prob. 59PCh. 4.3 - Prob. 60PCh. 4.3 - A 48-in. boom is held by a ball-and-socket joint...Ch. 4.3 - Prob. 62PCh. 4.3 - The 6-m pole ABC is acted upon by a 455-N force as...Ch. 4.3 - A 600-lb crate hangs from a cable that passes over...Ch. 4.3 - The horizontal platform ABCD weighs 60 lb and...Ch. 4.3 - Prob. 66PCh. 4.3 - Prob. 67PCh. 4.3 - Prob. 68PCh. 4.3 - A 10-kg storm window measuring 9001500 mm is held...Ch. 4.3 - Prob. 70PCh. 4.3 - Prob. 71PCh. 4.3 - Solve Prob. 4.69, assuming that the hinge at A has...Ch. 4.3 - Prob. 73PCh. 4.3 - Three rods are welded together to form a corner...Ch. 4.4 - Determine whether the block shown is in...Ch. 4.4 - Prob. 76PCh. 4.4 - Determine whether the block shown is in...Ch. 4.4 - Prob. 78PCh. 4.4 - Prob. 79PCh. 4.4 - Prob. 80PCh. 4.4 - Prob. 81PCh. 4.4 - Prob. 82PCh. 4.4 - Prob. 83PCh. 4.4 - Knowing that P=100N, determine the range of values...Ch. 4.4 - A 120-lb cabinet is mounted on casters that can be...Ch. 4.4 - Prob. 86PCh. 4.4 - A 40-kg packing crate must be moved to the left...Ch. 4.4 - A 40-kg packing crate is pulled by a rope as...Ch. 4.4 - Prob. 89PCh. 4.4 - Prob. 90PCh. 4.4 - Prob. 91PCh. 4.4 - Prob. 92PCh. 4.4 - Prob. 93PCh. 4.4 - Prob. 94PCh. 4.4 - Prob. 95PCh. 4.4 - Prob. 96PCh. 4.4 - The cylinder shown is of weight W and radius r,...Ch. 4.4 - Prob. 98PCh. 4 - A T-shaped bracket supports the four loads shown....Ch. 4 - Neglecting friction and the radius of the pulley,...Ch. 4 - Member ABC is supported by a pin and bracket at B...Ch. 4 - Prob. 102RPCh. 4 - Prob. 103RPCh. 4 - Prob. 104RPCh. 4 - Prob. 105RPCh. 4 - Prob. 106RPCh. 4 - Prob. 107RPCh. 4 - Prob. 108RPCh. 4 - Prob. 109RPCh. 4 - Two 10-lb blocks A and B are connected by a...
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- Q4.) The 12 kg block A and 10 kg block B are pinned to a rod having negligible mass and resting on horizontal surfaces. A horizontal force P is applied to the rod at end C increasing gradually from zero until motion first begins. a) If the coefficient of static friction between both blocks and each surface is μ = 0.45, determine the value for P at which point motion first begins and describe the motion that occurs in a few brief words. b) If the coefficient of static friction between both blocks and each surface is μ = 0.6, determine the value for P at which point motion first begins and describe the motion that occurs in a few brief words. (Hint: Consider drawing the system as one FBD for this analysis and treat each block as a particle with negligible dimensions) 100 mm 200 mm с Bo 10 kg 25° A 12 kg 12 kgarrow_forwardQ4.) An 8-foot-long uniform slender rod is connected to a 20-lb. block by a cord and pulley system as shown where LAO = 6 ft. The coefficient of static friction between the block and the surface is 0.6. Determine the range of rod weights for which the system remains in equilibrium. Assume friction is negligible between the pulleys and the cord. Consider both slipping and tipping. 30° 30° 6 ft 2.5 ft/ B 2 ft 40⁰ 3.5 ftarrow_forwardEXERCISE 2.34 The cable, whose length is 300 mm, is fastened to the 500-g block. Clockwise rotation of the arm at a constant angular speed of 5 rad/s causes the block to slide outward. The motion occurs in the vertical plane, and the coefficient of sliding friction is 0.4. Determine the tensile force in the cable and the force exerted by the block on the walls of the groove when = 53.1301⁰. 300 mm -300 mm- (Hint: use polar coordinates to solve the problem. R is from the rotation center of the arm to the block and is as shown in the Figure. Let L be the total length of the cable and S be the length from the clamped end of the cable to the end of the arm.)arrow_forward
- F Q4.A. An effort F is required just to move a certain body of weight 393 N up an inclined plane of angle 15'. The force F is acting parallel to the plane. If the coefficient of friction is 0.295, find the value of F. 15 W B. The following vector act at a point draw it 1- 40 N inclined at 24' N of W 2- 25 N inclined at 30 S of E 3- 15 N inclined at 20° S Of W 4- 20 N to the Sarrow_forwardSITUATION 2: A packing crate of mass 40 kg is pulled by a rope as shown. Knowing that the coefficient of static friction between the crate and the floor is 0.35, answer the following questions: 4. If α = 40°, determine the magnitude of the force P required to move the crate, in N. (ANSWER: 139) 5. If the crate must be moved to the left along the floor without tipping, determine the largest allowable value of α in degrees. (ANSWER: 58)arrow_forwardA 81-lb sheet of plywood rests on two small wooden blocks as shown. It is allowed to lean 20° from the vertical under the action of a force P which is perpendicular to the sheet. Friction at all surfaces of blocks A and B is sufficient to prevent slipping. Determine the magnitude P and the vertical reaction forces at A and B. D 4.0' 1.0' E A 5.2' DE = 3.3 ft 1.8' B 1 -20⁰arrow_forward
- Question 2: -0.6 m- The uniform 60-kg crate C rests uniformly on a 10-kg dolly D. If the front casters of the dolly at A are locked to prevent rolling while the casters at B are free to rollI, determine the maximum force P that may be applied without causing motion of the crate. The coefficient of static friction 1.5 m 0.8 m between the casters and the floor is uf = 0.35 and between the dolly and the crate, µa = 0.5. |D 0.25 moB A 0.25 m 1.5 marrow_forward1. The 20kg cylinder and 50 kg cylinder are connected together using a rope that passes around a rough peg two and a half turns. If the cylinders are on the verge of moving, determine the coefficient of static friction between the rope and the peg.arrow_forwardAs shown, a man is leaning against the side of a cabinet with an unusual design. The cabinet's main body weighs 25 kg, while the upper rectangular portion weighs 3 kg. Assume the coefficients of friction between the cabinet and the floor are μs = 0.33 and μk = 0.28. Knowing that the force P exerted by the man's shoulder on the horizontal cabinet: 2. Determine which of the following is the CORRECT equilibrium equation obtained from the system's force diagram. A. ΣF = 0: N - 245.25 = 0B. ΣF = 0: P - μ N = 0C. ΣM = 0: 245.25(0.55) + 29.43(0.2) - N(x) - P(1.5) = 0arrow_forward
- Problem 4.15 As illustrated in Fig. 4.62, consider a simple traction device applied to the leg of a patient such that the cable of the pulley makes an angle a = 35° with the hori- zontal. The leg is in a cast and the coefficient of friction between the cast and the bed is µ = 0.45. The weight of the leg is W = 180 N. Determine the tension in the cable. Answer: T = 75 N yarrow_forward3. Determine whether the block shown is in equilibriumand find the magnitude and direction of the friction force when 0= 40 and P=400 N P 800 N Hy = 0.20 Hk = 0.15 25°arrow_forwardDetermine whether the block shown is in equilibrium and find the magnitude and direction of the friction force when P = 120lb.arrow_forward
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