University Physics Volume 1 18th Edition
ISBN: 9781938168277
Author: William Moebs, Samuel J. Ling, Jeff Sanny
Publisher: William Moebs, Samuel J. Ling, Jeff Sanny
1 Units And Measurement 2 Vectors 3 Motion Along A Straight Line 4 Motion In Two And Three Dimensions 5 Newton's Law Of Motion 6 Applications Of Newton's Laws 7 Work And Kinetic Energy 8 Potential Energy And Conservation Of Energy 9 Linear Momentum And Collisions 10 Fixed-axis Rotation 11 Angular Momentum 12 Static Equilibrium And Elasticity 13 Gravitation 14 Fluid Mechanics 15 Oscillations 16 Waves 17 Sound Chapter12: Static Equilibrium And Elasticity
Chapter Questions Section: Chapter Questions
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... Problem 12CQ: A painter climbs a ladder. Is the ladder more likely to slip when the painter Is near the bottom or...
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Concept explainers
A 0.005 00-kg bullet traveling3 m/s enters an 18.0-kgangular momentum
Transcribed Image Text: Hinge
18.0 kg
0.005 00 kg
Figure P8.64. An
overhead view of a
bullet striking a door.
Definition Definition Product of the moment of inertia and angular velocity of the rotating body: (L) = Iω Angular momentum is a vector quantity, and it has both magnitude and direction. The magnitude of angular momentum is represented by the length of the vector, and the direction is the same as the direction of angular velocity.
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