Problem 12.1CYU: Check Your Understanding Solve Example 12.1 by choosing the pivot at the location of the rear axle. Problem 12.2CYU: Check your Understanding Explain which one of the following satisfies both equilibrium conditions:... Problem 12.3CYU: Check your Understanding Repeat Example 12.3 using the left end of the meter stick to calculate the... Problem 12.4CYU: Check Your understanding Repeat ExampIe12.4 assuming that the forearm is object of uniform density... Problem 12.5CYU: Check Your Understanding For the situation in described in Example 12.5, determine the values of the... Problem 12.6CYU: Check Your Understanding Solve the problem in Example 12.6 by taking the pivot position at the... Problem 12.7CYU: Check Your Understanding A 50-kg person stands 1.5 m away from one end of a uniform 6.0-m-long... Problem 12.8CYU: Check Your Understanding A 400.0-N sign hangs from the end of a uniform strut. The strut is 4.0 m... Problem 12.9CYU: Check Your Understanding Find the compressive stress and strain at the base of Nelson’s column. Problem 12.10CYU: Check Your Understanding A 2.0-m-long wire stretches 1.0 mm when subjected to a load. What is the... Problem 12.11CYU: Check Your Understanding If the normal force acting on each face of a cubical 1.0m3 piece of steel... Problem 12.12CYU: Check Your Understanding Explain why the concepts of Young’s modulus and shear modulus do not apply... Problem 1CQ: What can you say about the velocity of a moving body that is in dynamic equilibrium? Problem 2CQ: Under what conditions can a rotating body be in equilibrium? Give an example. Problem 3CQ: What three factors affect the torque created by a force relative to a specific pivot point? Problem 4CQ: Mechanics sometimes put a length of pipe over the handle of a wrench when trying to remove a very... Problem 5CQ: If there is only one external force (or toe) acting on object. It cannot be on equilibrium. Problem 6CQ: If an object is in equilibrium there must be an even number of forces acting on it. Problem 7CQ: If an odd number of forces act on an object, the object cannot be in equilibrium. Problem 8CQ: A body moving in a circle with a constant seed is in rotational equilibrium. Problem 9CQ: What purpose is served by a long and flexible pole carried by wire-walkers? Problem 10CQ: Is it possible to rest a ladder against a rough wall when the floor is frictionless? Problem 11CQ: Show how a spring scale and a simple fulcrum can be used to weigh an object whose weight is larger... Problem 12CQ: A painter climbs a ladder. Is the ladder more likely to slip when the painter Is near the bottom or... Problem 13CQ: Note: Unless stated otherwise, the weights of the wires, rods, and other elements are assumed to be... Problem 14CQ: When a glass bottle full of vinegar warms up, both the vinegar and the glass expand, but the vinegar... Problem 15CQ: A thin wire strung between two nails in the wall is used to support a large picture. Is the wire... Problem 16CQ: Review the relationship between stress and strain. Can you find any similarities between the two... Problem 17CQ: What type of stress are you applying when you press on the ends of a wooden rod? When you pull on... Problem 18CQ: Can compress stress be applied to a rubber band? Problem 19CQ: Can Young’s modulus have a negative value? What about the bulk modulus? Problem 20CQ: If a hypothetical material has a negative bulk modulus, with happens when you squeeze a piece of it? Problem 21CQ: Discuss how you might measure the bulk modulus of a liquid. Problem 22CQ: Note: Unless stated othen.ise the weights of the wires, rods, and other elements are assumed to be... Problem 23CQ: Steel rods are commonly placed in concrete before it sets. What Is the purpose of se rods?s Problem 24P: When tightening a bolt, you push perpendicularly on a wrench with a force of 165N at a distance of... Problem 25P: When opening do you push on it perpendicularly with a force of 55.0 N at a distance of 0.850 m from... Problem 26P: Find the magnitude of the tension in each supporting cable shown below. In each case, the weight of... Problem 27P: What force must be applied at point P to keep the structure shown in equilibrium? The weight of the... Problem 28P: Is it possible to apply a force at P to keep in equilibrium the structure shown? The weight of the... Problem 29P: Two children push on opposite of a door during ply. Both push horizontally and perpendicular to the... Problem 30P: A small 1000-kg SUV has a wheel base of 3.0 m. If 60 if its weight rests on the front wheels is the... Problem 31P: The uniform seesaw is balanced at its center of mass, as seen below. The smaller boy on the right... Problem 32P: A uniform plank rests on a level surface as shown below. The plank has a mass of 30 kg and is 6.0 m... Problem 33P: The uniform seesaw shown below is balanced on a fulcrum located 3.0 m from the left end. The smaller... Problem 34P: In order to get his car out of the mud, a man ties one end of a rope to the front bumper and the... Problem 35P: A uniform 40.0-kg scaffold of length 60 m is supported by tow light cables below. An 80.0 kg painter... Problem 36P: When the structure shown below is supported at point P, it is in equilibrium. Find the magnitude .of... Problem 37P: To get up on the roof, a person (mass 70.0 kg) places 6.00-m aluminum ladder (mass 10.0 kg) against... Problem 38P: A uniform horizontal strut weighs 400.0 N. One end of the strut is attached to a hinged support the... Problem 39P: The forearm shown below is positioned at an angle with respect to the upper arm , and a 5.0- kg... Problem 40P: The uniform boom shown below weighs 3000N . It is supported by the horizontal guy wire and by the... Problem 41P: The uniform boom shown below weighs 700N , and the object hanging from its right end weighs 400N .... Problem 42P: A 12.0m boom, of a crane lifting a 3000kg load is shown below. The center of mass of the boom is at... Problem 43P: A uniform trapdoor shown below is 1.0m by 1.5m and weighs 300N . It is supported by a single hinge... Problem 44P: A 90kg man walks on a sawhorse, as shown below. The sawhorse is 2.0m long and 1.0m high, and its... Problem 45P: The “lead” in pencils is a graphite composition with a Young’s modulus of approximately 1.0109N/m2 .... Problem 46P: TV broadcast antennas are the tallest artificial structure on Earth. In 1987 , a 72.0kg physicist... Problem 47P: By how much does a 65.0kg mountain climber stretch her 0.800cm diameter nylon rope when she hangs... Problem 48P: When water freezes, its volume increases by 9.05 . What force per unit area is water capable of... Problem 49P: A farmer making grape juice fills a glass bottle to the brim and caps it tightly. The juice expands... Problem 50P: A disk between vertebrae in the spine is subjected to a shearing force of 600.0N . Find its shear... Problem 51P: A vertebrae is subjected to a shearing force of 500.0N . Find the shear deformation, taking the... Problem 52P: Calculate the force a piano tuner applies to stretch a steel piano wire by 8.00mm , if the wire is... Problem 53P: A 20.0m -tall hollow aluminium flagpole is equivalent in strength to a solid cylinder 4.00cm in... Problem 54P: A copper wire of diameter 1.0cm stretches 1.0 when it is used to lift a load upward with an... Problem 55P: As an oil well is drilled, each new section of drill pipe support its own weight and the weight of... Problem 56P: Alarge uniform cylindrical steel rod of density =7.8g/cm3 is 2.0 m long and has a diameter of 5.0... Problem 57P: A 90-kg mountain climber bangs from a nylon rope and stretches it by 25.0 cm. If the rope was... Problem 58P: A suspender rod of a suspension bridge is 25.0 m long. If the rod is made of steel, what must its... Problem 59P: A copper wire is 1.0 m long and it diameter is 1.0 mm. if the wire hangs vertically how much weight... Problem 60P: A 100-N weight is attached to a free end of a metallic wire that hangs from the ceiling. When a... Problem 61P: The bulk modulus of a material is 1.01011N/m2 . What fractional change in volume does a piece of... Problem 62P: Normal forces of magnitude 1.0106N are applied uniformly to a spherical surface enclosing a volume... Problem 63P: During a walk on a rope, a tightrope walker creates a tension of 3.94103N in a wire that are 15.0m... Problem 64P: When using a pencil eraser, you exert a vertical force of 6.00N at a distance of 2.00cm from the... Problem 65P: Normal forces are applied uniformly over the surface of a spherical volume of water whose radius is... Problem 66P: A uniform rope of cross-sectional area 0.50cm2 breaks when the tensile stress in it reaches... Problem 67P: One end of a vertical metallic wire of length 2.0m and diameter 1.0mm is attached to a ceiling, and... Problem 68P: An aluminium (=2.7g/cm3) wire is suspended from the ceiling and hangs vertically. How long must the... Problem 69AP: The coefficient of static friction between the rubber eraser of the pencil and the tabletop is... Problem 70AP: A pencil rests against a corner, as shown below. The sharpened end of the pencil touches a rough... Problem 71AP: A uniform 4.0m plank weighing 200.0N rests against the corner of a wall, as shown below. There is no... Problem 72AP: A 40kg boy jumps from a height of 3.0m , lands on one foot and comes to rest in 0.10s after he hits... Problem 73AP: Two thin rods, one made of steel and the other of aluminium, are joined end to end. Each rod is 2.0m... Problem 74AP: Two rods, one made of copper and the other of steel, have the same dimensions. If the copper rod... Problem 75CP: A horizontal force F is applied to a uniform sphere in direction exact toward the center of the... Problem 76CP: When a motor is set on a pivoted mount seen below, its weight can be used to maintain tension in the... Problem 77CP: Two wheels A and B with weights w and 2w , respectively,are connected by a uniform rod with weight... Problem 78CP: Weights are gradually added to a pan until a wheel of mass M and radius R is pulled over an obstacle... Problem 79CP: In order to lift a shovelful of dirt, a gardener pushes downward on the end of the shovel and pulls... Problem 80CP: A uniform rod of length 2R and mass M is attached to a small collar C and rests on a cylindrical... Problem 81CP: The pole shown below is at a 90.0 bend in a power line and is therefore subjected to more shear... format_list_bulleted
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