Multiple choice lang po 3. Which of the following statement is true?A. A rotating object or system will never be in equilibrium.B. Only stationary objects are to be considered in equilibrium.C. Equilibrium is the state of a body at rest or in uniform motion.D. In equilibrium, at least one direction should have a net force of zero.5. A uniform 40 N board supports two children weighing 500 N and 350 N. If the support is at the center of the boardand the 500 N child is 1.5 m from its center, how far is the 350 N child from the center?А. 1.1 mВ. 1.5 mC. 2.1 mD. 2.7 m7. Which of the following statement is true about any stationary object or object moving at constant velocity?A. No forces act on the object.B. The net forces acting on the object is zero.C. The net forces acting on the object is not zero.D. Only two forces with different directions are acting on the object.11. Which of the following is NOT a condition for an object to be in static equilibrium?A. It is not moving.B. It is in rotational equilibrium.C. It is in translational equilibrium.D. It is moving at constant velocity.12. What is static equilibrium?A. When an object is in translational equilibrium.B. When an object is moving and the forces on it are balanced.C. When the linear forces on an object in three dimensions are balanced.D. When an object is not moving, and the various influences on that object are balanced.side of the pivot, such that a 220 N force will make the child lift off the ground?A. 0.10 mВ. 1.0 mC. 1.5 mD. 9.8 m

3. Which of the following statement is true? A. A rotating object or system will never be in equilibrium. B. Only stationary objects are to be considered in equilibrium. C. Equilibrium is the state of a body at rest or in uniform motion. D. In equilibrium, at least one direction should have a net force of zero.

3. Which of the following statement is true? A. A rotating object or system will never be in equilibrium. B. Only stationary objects are to be considered in equilibrium. C. Equilibrium is the state of a body at rest or in uniform motion. D. In equilibrium, at least one direction should have a net force of zero.

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter12: Static Equilibrium And Elasticity

Section: Chapter Questions

Problem 12.4OQ: Two forces are acting on an object. Which of the following statements is correct? (a) The object is...

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Two forces are acting on an object. Which of the following statements is correct? (a) The object is in equilibrium if the forces are equal in magnitude and opposite in direction. (b) The object is in equilibrium if the net torque on the object is zero. (c) The object is in equilibrium if the forces act at the same point on the object. (d) The object is in equilibrium if the net force and the net torque on the object are both zero. (e) The object cannot be in equilibrium because more than one force acts on it.
Answer yes or no 10 (he following questions, (a) Is it possible to calculate the torque acting on a rigid object without specifying an axis of rotation? (b) Is the torque independent of the location of the axis of rotation?
Torque and the Two Conditions for Equilibrium 17. The arm in Figure P8.17 weighs 41.5 N. The force of gravity acting on the arm acts through point A. Determine the magnitudes of the tension force Ft, in the deltoid muscle and the force Fs exerted by the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown. Figure P8.17
(a) Give an example in which the net force acting on an object is zero and yet the net torque is nonzero, (h) (five an example in which the net torque acting on an object is zero and yet the net force is nonzero.
The Iron Cross When a gymnast weighing 750 N executes the iron cross as in Figure lN.91a, the primary muscles involved in supporting this position are the latissimus dorsi (lats") and the pectoralis major (pecs"). The rings exert an upward force on the aims and support the weight of the gymnast. The force exerted by the shoulder joint on the arm is labeled Fs, while the two muscles exert a total force Fw on the arm. Estimate the magnitude of the force Fw. Note that one ring supports half the weight of the gymnast, which is 375 N as indicated in Figure P8.91b. Assume that the force Fw acts at an angle of 45 below the horizontal at a distance of 4.0 cm from the shoulder joint In your estimate, take the distance from the shoulder joint to the hand to be L = 70 cm and ignore the weight of the arm.
When tightening a bolt, you push perpendicularly on a wrench with a force of 165 N at a distance of 0.140 m from the center of the bolt. (a) How much torque are you exerting in newton meters (relative to the center of the bolt)? (b) Convert this torque to foot pounds.
(i) If you are trying to loosen a stubborn screw from a piece of wood with a screwdriver and fail, should you find a screwdriver for which the handle is (a) longer or (b) fatter? (ii) If you are trying to loosen a stubborn bolt from a piece of metal with a wrench and fail, should you find a wrench for which the handle is (a) longer or (b) fatter?
Unreasonable Results Suppose two children are using a uniform seesaw that is 3.00 m long and has its center of mass over the pivot. The first child has a mass of 30.0 kg and sits 1.40 m from the pivot. (a) Calculate where the second 18.0 kg child must sit to balance the seesaw. (b) What is unreasonable about the result? (c) Which premise is unreasonable, or which premises are inconsistent?
Torque and the Two Conditions for Equilibrium 17. The arm in Figure P8.17 weighs 41.5 N. The force of gravity acting on the arm acts through point A. Determine the magnitudes of the tension force Ft, in the deltoid muscle and the force Fs exerted by the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown. Figure P8.17
A simple pendulum consists of a small object of mass 3.0 kg hanging at the end of a 2.0-m-long light string that is connected to a pivot point. (a) Calculate the magnitude of the torque (due to the force of gravity) about this pivot point when the string makes a 5.0 angle with the vertical. (b) Does the torque increase or decrease as the angle increases? Explain. Figure P8.6
1. When an object is experiencing a net torque? A. it is translating B. it is in static equilibrium. C. it is in dynamic equilibrium. D. it is rotating 2. Does a bridge anchored resting on two pillars have any torque? A. Yes, but it is at equilibrium B. No, Bridges can't have torque C. No, it isn't moving D. Yes, but it will soon break because of the torque
Choose the letter of the correct answer. _____1. The easiest way to open a heavy door is by applying the force. a. Near the hinges b. At the edge of the door far from the hinges c. In the middle of the door d. At the top of the door _____2. What is the Unit for Torque? a. N.m b. W c. N d. J _____3. When an object is experiencing a net torque. a. It is in dynamic equilibrium b. It is rotating c. It is in static equilibrium d. It is translating _____4. The moment of inertia of a body depends on which of the following? a. Shape of the body b. Mass of the body c. Location of the axis of rotation d. B & C only e. A, B and C _____5. This concept is an equivalent to Newton’s 1ˢᵗ law for a rotational system. a. Rotational equilibrium b. Static equilibrium c. Dynamic Torque d. Static Torque