Concept explainers
(a)
Whether the given statement is true or false.
(a)
Answer to Problem 1P
False.
Explanation of Solution
If an object is to be in equilibrium, the net force as well as net torque about any point must be zero. It is not sufficient that only net force is zero.
Conclusion:
Thus, the given statement is false.
(b)
Whether the given statement is true or false.
(b)
Answer to Problem 1P
True
Explanation of Solution
If an object is to be in equilibrium, the net force as well as net torque about any point must be zero. It is not sufficient that only net force is zero but it is necessary that it is zero.
Conclusion:
The given statement is true.
(c)
Whether the given statement is true or false.
(c)
Answer to Problem 1P
True
Explanation of Solution
If an object is to be in equilibrium, the net force as well as net torque about any point must be zero. This means
Conclusion:
The given statement is true.
(d)
Whether the given statement is true or false.
(d)
Answer to Problem 1P
False
Explanation of Solution
If an object is to be in equilibrium, the net force as well as net torque about any point must be zero.
This does not mean that the object is at rest. It could be at rest or moving with constant velocity or rotating with constant angular speed.
Conclusion:
The given statement is false.
Want to see more full solutions like this?
Chapter 12 Solutions
Physics for Scientists and Engineers
- Find the net torque on the wheel in Figure P10.23 about the axle through O, taking a = 10.0 cm and b = 25.0 cm. Figure P10.23arrow_forwardIn checking a recently installed fencepost for adequacy of the ground support, a person exerts a force P = (-180i + 60j + 105k) N on the top of the post as shown. Determine the angles which P makes with the positive x axis and with the x-z plane. Answers: ex = the tolerance is +/-2% ex-zarrow_forwardTwo forces of an equal magnitude and opposite directions are applied to a rigid object. Will the object necessary be in equilibrium? O Yes, always O The object will be in equilibrium only when one of the forces is applied to its center of mass O No, because the object may have non-zero translational acceleration O No, because the object may have non-zero angular accelerationarrow_forward
- A wrench of length X cm is used to loosen a nut attached to a bolt. If a perpendicular force F Newtons is applied to the wrench, arrange in order of maximum to minimum, the torque that can be applied on the nut. Maximum 1 F(X-4)/100 Nm 2 F(X-2)/100 Nm 3 ⠀⠀FX/100 Nm + 4 F(X-X)/100 Nm Minimumarrow_forwardFor the next rigid object, determine the net torque applied on point P. The forces acting on the object are: A = (23,5 î + 14,7 ŷ)N; B = 33,8 £ N; Č = (51,4 î – 25,4 ŷ)N; D = –30,5 ŷ N. A 60 730° 60° 20 cmarrow_forwardConsider the object subject to the two forces of equal magnitude as shown. Choose the correct statement with regard to this situation. (a) The object is in force equilibrium but not torque equilibrium. (b) The object is in torque equilibrium but not force equilibrium. (c) The object is in both force equilibrium and torque equilibrium. (d) The object is in neither forceequilibrium nor torque equilibrium.arrow_forward
- A uniform meter stick has a 45.0 g mass placed at the 20 cm mark. If a pivot is placed at the 42.5 cm mark and the meter stick remains horizontal in static equilibrium, what is the mass of the meter stick? 0 20 42.5 60 80 100 45 g ////arrow_forwardConsider a rigid rod of length 2L acted upon by some forces. All forces labeled F have the same magnitude. Which cases have a net torque on the rod about its center?arrow_forwardIf the allowable bending stress is 0 = 218 MPa, find the magnitude of the maximum internal bending moment M₂ that can be supported by the beam. The moment of inertia about the z axis is 402,238,667 mm4. 16 mm 240 mm V O 698 kN-m O 501 kN-m O 579 kN-m O 651 kN-m O 461 kN-m 30 mm 350 mmarrow_forward
- PLEASEarrow_forwardFor a rigid body in equilibrium, identify the true statements about the action of a system of external forces. (Check all that apply.) It imparts translational motion. It imparts rotational motion. It imparts no rotational motion. It imparts no translational motion.arrow_forwardConsider a beam of length L = 11 feet with a fulcrum x feet from one end as shown in the figure. Two objects weighing 36 pounds and 96 pounds are placed at opposite ends of the beam. Find x (the distance between the fulcrum and the object weighing 36 pounds) such that the system is equilibrium. Object 1 09 feet O 10 feet O 7 feet 8 feet O 6 feet Ubject 2 XL-x->>arrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningGlencoe Physics: Principles and Problems, Student...PhysicsISBN:9780078807213Author:Paul W. ZitzewitzPublisher:Glencoe/McGraw-HillPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning