Applied Statics and Strength of Materials (6th Edition)
6th Edition
ISBN: 9780133840544
Author: George F. Limbrunner, Craig D'Allaird, Leonard Spiegel
Publisher: PEARSON
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Chapter 6, Problem 6.54SP
A sailor wraps a heavy rope around a bollard (a vertical post) to secure a drifting ship to a pier. The sailor can apply a force of 400 N to the free end of the rope. With what force can the ship pull on the rope before another sailor will have to be called? Consider (a) one wrap, (b) two wraps, (c) three wraps. Assume a coefficient of friction of 0.35.
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0.70 m
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A weight of 10 N resting on an inclined plane at
30° to the horizontal is connected bya string passing over a
frictionless pulley at the upper end of the inclined plane. The free end
of the string is connected to a weight of 20N which hangs in air. If
the coefficient of friction of the inclined surface is 0.2, calculate the
time taken by the hanging weight to decend by 1 m.
(1)
ON
u=0.2
(2)
30
20N
Given diagram
Fig
s=1m
A weight of 10 N resting on an inclined plane at
30° to the horizontal is connected by a string passing over a
frictionless pulley at the upper end of the inclined plane. The free end
of the string is connected to a weight of 20 N which hangs in air. If
the coefficient of friction of the inclined surface is 0.2, calculate the
time taken by the hanging weight to decend by 1 m.
(1)
VON
u=0.2
(2)
30°
20N
Given diagram
Fig
s=1m
Chapter 6 Solutions
Applied Statics and Strength of Materials (6th Edition)
Ch. 6 - A 150 Ib block rests on a horizontal floor. The...Ch. 6 - A 200 lb block rests on a horizontal surface. The...Ch. 6 - A tool locker having a mass of 140 kg rests on a...Ch. 6 - A body weighing 100 lb rests on an inclined plane,...Ch. 6 - For Problem 6.4 , compute the friction force F...Ch. 6 - Block A in the figure shown has a mass of 10 kg...Ch. 6 - Compute the horizontal force P required to cause...Ch. 6 - Prob. 6.8PCh. 6 - Calculate the magnitude of the force P, acting as...Ch. 6 - For the block-and-wedge system shown in Figure...
Ch. 6 - Calculate the value of the horizontal force P...Ch. 6 - Two blocks, each having a mass of 100 kg and...Ch. 6 - Calculate the force P required to move the wedges...Ch. 6 - A heavy machine is lowered into a pit by means of...Ch. 6 - Calculate the maximum weight that the person in...Ch. 6 - A flat belt passes halfway around a...Ch. 6 - A belt-and-pulley arrangement has a maximum belt...Ch. 6 - Rework Problem 6.17 for a V-belt with a 40° groove...Ch. 6 - A mass of 320 kg is prevented from falling by a...Ch. 6 - A belt is wrapped around a pulley for 180°. The...Ch. 6 - A jackscrew has a square thread with a pitch of...Ch. 6 - The mean diameter of a square-threaded jackscrew...Ch. 6 - The woodworking vise shown is designed for a...Ch. 6 - A square-threaded screw is used ii a press, shown,...Ch. 6 - For the following computer problems, any...Ch. 6 - Prob. 6.26CPCh. 6 - For the following computer problems, any...Ch. 6 - 6.28 A horizontal force of 18 lb is required to...Ch. 6 - 6.29 A 90-Ib block lying on a rough horizontal...Ch. 6 - 6.30 The tool locker of Problem 6.3 is 0.8 m by...Ch. 6 - Prob. 6.31SPCh. 6 - A 50-lb block rests on a rough inclined plane. If...Ch. 6 - If in Problem 6-32 the plane has an inclination...Ch. 6 - A 325-lb block rests on a plane inclined 25° with...Ch. 6 - A 47 lb body is supported on a plane inclined 33°...Ch. 6 - Prob. 6.36SPCh. 6 - In the figure shown, block A weighs 200 lb and...Ch. 6 - Calculate the magnitude of the horizontal force P,...Ch. 6 - In the figure shown, the coefficient of static...Ch. 6 - A 500-lb block rests on a horizontal surface, as...Ch. 6 - A ladder, 8 m long and having a mass of 25 kg,...Ch. 6 - The ladder shown is supported by a horizontal...Ch. 6 - 6.43 A 16-ft ladder weighing 62 lb (assumed...Ch. 6 - Prob. 6.44SPCh. 6 - 6.45 Compute the minimum weight of block B that...Ch. 6 - Prob. 6.46SPCh. 6 - Prob. 6.47SPCh. 6 - Prob. 6.48SPCh. 6 - Prob. 6.49SPCh. 6 - Prob. 6.50SPCh. 6 - Calculate the force P necessary to start the block...Ch. 6 - A machine having a mass of 500 kg is to be raised...Ch. 6 - 6.53 A ship may exert an estimated pull of 8000 lb...Ch. 6 - A sailor wraps a heavy rope around a bollard (a...Ch. 6 - When a large rope is wrapped twice around a post,...Ch. 6 - A band brake is in contact with drum C through an...Ch. 6 - Prob. 6.57SPCh. 6 - The mean diameter of a square-threaded jackscrew...Ch. 6 - The manually operated apple cider press shown has...
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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?arrow_forwardA uniform ladder 18 ft long and weighing 120 lbs rests against a smooth wall. The angle between it and the floor is 70°. The coefficient of friction between the floor and the ladder is 0.25. How far up the ladder can a 180 lb man walk before the ladder slips? (A) 10.0 ft (C) 14.6 ft (B) 12.2 ft (D) 16.6 ftarrow_forwardA 40lb ladder 12ft long leans against the wall making an angle of 30-degree with the wall. When a 190lbf man reached a point 8ft from the lower end, the ladder is just about to slip. Calculate the coefficient of friction between the ladder and the floor. Note: the coefficient of friction between the ladder and the wall is 0.20arrow_forward
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