1 Physics And Measurement 2 Motion In One Dimension 3 Vectors 4 Motion In Two Dimensions 5 The Laws Of Motion 6 Circular Motion And Other Applications Of Newton’s Laws 7 Energy Of A System 8 Conservation Of Energy 9 Linear Momentum And Collisions 10 Rotation Of A Rigid Object About A Fixed Axis 11 Angular Momentum 12 Static Equilibrium And Elasticity 13 Universal Gravitation 14 Fluid Mechanics 15 Oscillatory Motion 16 Wave Motion 17 Sound Waves 18 Superposition And Standing Waves 19 Temperature 20 The First Law Of Thermodynamics 21 The Kinetic Theory Of Gases 22 Heat Engines, Entropy, And The Second Law Of Thermodynamics 23 Electric Fields 24 Gauss’s Law 25 Electric Potential 26 Capacitance And Dielectrics 27 Current And Resistance 28 Direct-current Circuits 29 Magnetic Fields 30 Sources Of The Magnetic Field 31 Faraday’s Law 32 Inductance 33 Alternating Current Circuits 34 Electromagnetic Waves 35 The Nature Of Light And The Principles Of Ray Optics 36 Image Formation 37 Wave Optics 38 Diffraction Patterns And Polarization 39 Relativity Chapter12: Static Equilibrium And Elasticity
Chapter Questions Section: Chapter Questions
Problem 12.1QQ: Consider the object subject to the two forces of equal magnitude in Figure 12.2. Choose the correct... Problem 12.2QQ: Consider the object subject to the three forces in Figure 12.3. Choose the correct statement with... Problem 12.3QQ: A meterstick of uniform density is hung from a string tied at the 25-cm mark. A 0.50-kg object is... Problem 12.4QQ: For the three parts of this Quick Quiz, choose from the following choices the correct answer for the... Problem 12.1OQ: The acceleration due to gravity becomes weaker by about three parts in ten million for each meter of... Problem 12.2OQ: A rod 7.0 in long is pivoted at a point 2.0 m from the left end. A downward force of 50 N acts at... Problem 12.3OQ Problem 12.4OQ: Two forces are acting on an object. Which of the following statements is correct? (a) The object is... Problem 12.5OQ Problem 12.6OQ: A 20.0-kg horizontal plank 4.00 in long rests on two supports, one at the left end and a second 1.00... Problem 12.7OQ Problem 12.8OQ: In analyzing the equilibrium of a flat, rigid object, you are about to choose an axis about which... Problem 12.9OQ: A certain wire, 3 m long, stretches by 1.2 mm when under tension 200 N. (i) Does an equally thick... Problem 12.10OQ: The center of gravity of an ax is on the centerline of the handle, close to the head. Assume you saw... Problem 12.1CQ: A ladder stands on the ground, leaning against a wall. Would you feel safer climbing up the ladder... Problem 12.2CQ Problem 12.3CQ: (a) Give an example in which the net force acting on an object is zero and yet the net torque is... Problem 12.4CQ Problem 12.5CQ Problem 12.6CQ: A girl has a large, docile dog she wishes to weigh on a small bathroom scale. She reasons that she... Problem 12.7CQ Problem 12.8CQ: What kind of deformation does a cube of Jell-O exhibit when it jiggles? Problem 12.1P: What are the necessary conditions for equilibrium of the object shown in Figure P12.1? Calculate... Problem 12.2P: Why is the following situation impossible? A uniform beam of mass mk = 3.00 kg and length = 1.00 m... Problem 12.3P Problem 12.4P Problem 12.5P: Your brother is opening a skateboard shop. He has created a sign for his shop made from a uniform... Problem 12.6P: A circular pizza of radius R has a circular piece of radius R/2 removed from one side as shown in... Problem 12.7P Problem 12.8P Problem 12.9P Problem 12.10P Problem 12.11P: A uniform beam of length 7.60 m and weight 4.50 102 N is carried by two workers, Sam and Joe, as... Problem 12.12P: A vaulter holds a 29.4-N pole in equilibrium by exerting an upward force U with her leading hand and... Problem 12.13P: A 15.0-in uniform ladder weighing 500 N rests against frictionless wall. The ladder makes a 60.0... Problem 12.14P: A uniform ladder of length L.and mass m1 rests against a frictionless wall. The ladder makes an... Problem 12.15P: A flexible chain weighing 40.0 N hangs between two hooks located at the same height (Fig. P12.9). At... Problem 12.16P: A uniform beam of length L and mass m shown in Figure P12.8 is inclined at an angle to the... Problem 12.17P: Figure P12.13 shows a claw hammer being used to pull a nail out of a horizontal board. The mass of... Problem 12.18P: A 20.0-kg floodlight in a park is supported at the end of a horizontal beam of negligible mass that... Problem 12.19P Problem 12.20P: Review. While Lost-a-Lot ponders his next move in the situation described in Problem 11 and... Problem 12.21P: John is pushing his daughter Rachel in a wheelbarrow when it is stopped by a brick 8.00 cm high... Problem 12.22P Problem 12.23P: One end of a uniform 4.00-m-long rod of weight Fg is supported by a cable at an angle of = 37 with... Problem 12.24P: A 10.0-kg monkey climbs a uniform ladder with weight 1.20 102 N and length L = 3.00 m as shown in... Problem 12.25P: A uniform plank of length 2.00 m and mass 30.0 kg is supported by three ropes as indicated by the... Problem 12.26P: A steel wire of diameter 1 mm can support a tension of 0.2 kN. A steel cable to support a tension of... Problem 12.27P: The deepest point in the ocean is in the Mariana Trench, about 11 km deep, in the Pacific. The... Problem 12.28P: Assume Youngs modulus for bone is 1.50 1010 N/m2. The bone breaks if stress greater than 1.50 108... Problem 12.29P: A child slides across a floor in a pair of rubber-soled shoes. The friction force acting on each... Problem 12.30P: Evaluate Youngs modulus for the material whose stressstrain curve is shown in Figure 12.12. Figure... Problem 12.31P: Assume if the shear stress in steel exceeds about 4.00 108 N/m2, the steel ruptures. Determine the... Problem 12.32P: When water freezes, it expands by about 9.00%. What pressure increase would occur inside your... Problem 12.33P: A 200-kg load is hung on a wire of length 4.00m, cross-sectional area 0.200 10-4 m2, and Youngs... Problem 12.34P: A walkway suspended across a hotel lobby is supported at numerous points along its edges by a... Problem 12.35P: Review. A 2.00-m-long cylindrical steel wire with a cross-sectional diameter of 4.00 mm is placed... Problem 12.36P: Review. A 30.0-kg hammer, moving with speed 20.0 m/s, strikes a steel spike 2.30 cm in diameter. The... Problem 12.37AP: A bridge of length 50.0 m and mass 8.00 104 kg is supported on a smooth pier at each end as shown... Problem 12.38AP: A uniform beam resting on two pivots has a length L = 6.00 m and mass M = 90.0 kg. The pivot under... Problem 12.39AP Problem 12.40AP: The lintel of prestressed reinforced concrete in Figure P12.27 is 1.50 m long. The concrete encloses... Problem 12.41AP Problem 12.42AP: When a person stands on tiptoe on one foot (a strenuous position), the position of the foot is as... Problem 12.43AP: A hungry bear weighing 700 N walks out on a beam in an attempt to retrieve a basket of goodies... Problem 12.44AP: The following equations are obtained from a force diagram of a rectangular farm gate, supported by... Problem 12.45AP: A uniform sign of weight Fg and width 2L hangs from a light, horizontal beam hinged at the wall and... Problem 12.46AP: A 1 200-N uniform boom at = 65 to the vertical is supported by a cable at an angle = 25.0 to the... Problem 12.47AP Problem 12.48AP: Assume a person bends forward to lift a load with his back as shown in Figure P12.34a. The spine... Problem 12.49AP: A 10 000-N shark is supported by a rope attached to a 4.00-m rod that can pivot at the base. (a)... Problem 12.50AP: Why is the following situation impossible? A worker in a factory pulls a cabinet across the floor... Problem 12.51AP: A uniform beam of mass m is inclined at an angle to the horizontal. Its upper end (point P)... Problem 12.52AP Problem 12.53AP: When a circus performer performing on the rings executes the iron cross, he maintains the position... Problem 12.54AP: Figure P12.38 shows a light truss formed from three struts lying in a plane and joined by three... Problem 12.55AP Problem 12.56AP: A stepladder of negligible weight is constructed as shown in Figure P12.40, with AC = BC = = 4.00... Problem 12.57AP: A stepladder of negligible weight is constructed as shown in Figure P12.40, with AC = BC = . A... Problem 12.58AP: (a) Estimate the force with which a karate master strikes a board, assuming the hands speed at the... Problem 12.59AP: Two racquetballs, each having a mass of 170 g, are placed in a glass jar as shown in Figure P12.43.... Problem 12.60AP: Review. A wire of length L, Youngs modulus Y, and cross-sectional area A is stretched elastically by... Problem 12.61AP: Review. An aluminum wire is 0.850 m long and has a circular cross section of diameter 0.780 mm.... Problem 12.62AP Problem 12.63AP: A 500-N uniform rectangular sign 4.00 m wide and 3.00 m high is suspended from a horizontal,... Problem 12.64AP: A steel cable 3.00 cm2 in cross-sectional area has a mass of 2.40 kg per meter of length. If 500 m... Problem 12.65CP: A uniform pole is propped between the floor and the ceiling of a room. The height of the room is... Problem 12.66CP: In the What If? section of Example 12.2, let d represent the distance in meters between the person... Problem 12.67CP: Figure P12.67 shows a vertical force applied tangentially to a uniform cylinder of weight Fg. The... Problem 12.68CP: A uniform rod of weight Fg and length L is supported at its ends by a frictionless trough as shown... Problem 12.1P: What are the necessary conditions for equilibrium of the object shown in Figure P12.1? Calculate...
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What is a necessary condition for a body to be in rotational equilibrium ? B.) What happens to an object when a net torque is applied to it? C.) When is torque maximum? and when zero?
Definition Video Definition A state wherein a body is not experiencing any resultant angular acceleration. If the net torque acting on the body is zero, then the body is said to be in rotational equilibrium. If the body is stationary and net torque is zero, then the body is in static rotational equilibrium. If the body is moving with constant velocity and net torque is zero, then, the body is said to be in dynamic rotational equilibrium. Video
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