10th Edition

ISBN: 9781118230725

Author: David Halliday, Robert Resnick, Jearl Walker

Publisher: Wiley, John & Sons, Incorporated

Concept explainers

Rotational Equilibrium And Rotational Dynamics

In physics, the state of balance between the forces and the dynamics of motion is called the equilibrium state. The balance between various forces acting on a system in a rotational motion is called rotational equilibrium or rotational dynamics.

Equilibrium of Forces

The tension created on one body during push or pull is known as force.

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Chapter 12, Problem 37P

GO In Fig. 12-51, a uniform plank, with a length L of 6.10 m and a weight of 445 N, rests on the ground and against a frictionless roller at the top of a wall of height h = 3.05 m, The plank remains in equilibrium for any value of θ≥ 70° but slips if θ< 70°. Find the coefficient of static friction between the plank and the ground.

Chapter 12, Problem 37P, GO In Fig. 12-51, a uniform plank, with a length L of 6.10 m and a weight of 445 N, rests on the

Figure 12-51 Problem 37.

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Chapter 12, Problem 36P

Chapter 12, Problem 38P

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Problem 19 A uniform ladder is 10 m long and weighs 200 N. The ladder leans against a vertical, frictionless wall at heighth 8.0 m above the ground. A horizontal force Fis applied to the ladder at distance d = 2.0m from its base (measured along the ladder). أ (a) If the force magnitude is F = 50 N, what is the necessary friction (magnitude and direction) on the floor to keep the ladder stable? (b) Suppose the coefficient of static friction between the floor and the ladder is 0.5, find the maximum magnitude of force F just before the ladder starts to move.

(a) A uniform steel beam of mass 200.00 kg is held up by a steel cable that is connected to the beam a distance L 6.00 m from the wall, at an angle 0=30.00° as shown Figure 1. The beam is bolted to the wall with an unknown force F exerted by the wall on the beam. An object of mass 600.00 kg, resting on top of the beam, is placed a distance d 2.00 m from the wall. Solve this problem fully, by finding the tension in the cable, the horizontal and vertical components of the force that the wall exerts on the beam and its magnitude and its direction. Figure 1

A 10 m long ladder with mass of 20 kg rests against a smooth wall at height of 8 m at an inclination a to the rough ground floor. Assuming that there is no friction between the wall and the ladder, but there is a frictional force between the floor and the ladder. (a) Determine the minimum static coefficient of friction, 4 between the floor and the ladder for which equilibrium is possible. (b) A worker of mass 80 kg climbs up the ladder. Determine how far the worker may go up before the ladder starts to slip. (c) By comparing between frictional force of floor and wall, determine whether a worker can climb safely to the top of the ladder or not.

Chapter 12 Solutions

Fundamentals of Physics Extended

Ch. 12 - Figure 12-15 shows three situations in which the...Ch. 12 - In Fig, 12-16, a rigid beam is attached to two...Ch. 12 - Figure 12-17 shows four overhead views of rotating...Ch. 12 - A ladder leans against a frictionless wall but is...Ch. 12 - Figure 12-18 shows a mobile of toy penguins...Ch. 12 - Figure 12-19 shows an overhead view of a uniform...Ch. 12 - In Fig. 12-20, a stationary 5 kg rod AC is held...Ch. 12 - Three piatas hang from the stationary assembly of...Ch. 12 - In Fig. 12-22, a vertical rend is hinged at its...Ch. 12 - Figure 12-23 shows a horizontal block that is...

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