8-6. The 180-lb man climbs up the ladder and stops at the position shown after he senses that the ladder is on the verge of slipping. Determine the coefficient of static friction between the friction pad at A and ground if the inclination of the ladder is e = 60° and the wall at B is smooth. The center of gravity for the man is at G.Neglect the weight of the ladder.

8-6. The 180-lb man climbs up the ladder and stops at the position shown after he senses that the ladder is on the verge of slipping. Determine the coefficient of static friction between the friction pad at A and ground if the inclination of the ladder is e = 60° and the wall at B is smooth. The center of gravity for the man is at G.Neglect the weight of the ladder.

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter12: Static Equilibrium And Elasticity

Section: Chapter Questions

Problem 12.5CYU: Check Your Understanding For the situation in described in Example 12.5, determine the values of the...

See similar textbooks

Similar questions

Check Your Understanding For the situation in described in Example 12.5, determine the values of the coefficient s of static friction for which the ladder starts slipping, given that is the angle that the ladder makes with the floor.
Show that, as explained in the text, a force F exerted on a flexible medium at its center and perpendicular to its length (such as on the tightrope wire in Figure 5.26) gives rise to a tension of magnitude T=F/2sin() .
Determine the reaction at the smooth wall. The top of the 15kg ladder is leaning against a very smooth wall. Assume that the mass cebter of the painter is directly above his feet and that the coefficient of friction between the horizontal ground and the ladder is 0.25.
Calculate the horizontal force P on the light 13° wedge necessary to initiate movement of the 59-kg cylinder. The coefficient of static friction for both pairs of contacting surfaces is 0.33. Also determine the friction force Få at point B. (Caution: Check carefully your assumption of where slipping occurs.) P Answers: P = FB = i 138 59 kg B N N A
A worker wants to turnover a uniform, 1250 N, rectangularcrate by pulling at 53.0° on one ofits vertical sides (Fig.. Thefloor is rough enough to preventthe crate from slipping. (a) Whatpull is needed to just start thecrate to tip? (b) How hard does thefloor push upward on the crate? (c) Find the friction force on the crate.(d) What is the minimum coefficient of static friction needed to preventthe crate from slipping on the floor?
HER A man holds a 175-N ball in his hand, with the forearm horizontal (see the drawing). He can support the ball in this position because of the flexor muscle force M, which is applied perpendicular to the forearm. The forearm weighs 21.4 N and has a center of gravity as indicated. Upper am bone Flexor muscle cing fc Elbow joint 89) 00510 m r 0.0890 m 0.330 m- (a) Find the magnitude of M 1149 X N (b) Find the magnitude and direction of the force applied by the upper arm bone to the forearm at the elbow joint. magnitude direction downward Additional Materials Book ??TO MacBook Ait 7.
h L GAS A 45.0 kg sign hangs at the end of a bar where L = 3.10 meters in length. A cable attaches to the end of the horizontal bar and to a wall 2.70 meters above where the bar is attached to the wall. The bar has a mass of 13-kg. What is the tension in the cable? Give your answer in Newtons to 3 significant figures (no decimal places in this case).
Determine the force P required to force the 17° wedge under the 90-kg uniform crate which rests against the small stop at A. The coefficient of friction for all surfaces is 0.33.
1MO Noor-Book.co... > Determine the design angle (0° < ¢ < 90°) between struts AB and AC so that the 400-lb horizontal force has a component of 600 lb which acts up to the left, in 2–15. the same direction as from B towards A. Take 0 = 30°. 400 lb A to В C Probs. 2–14/15 *2-16. Resolve F¡ into components along the u and v axes and determine the magnitudes of these components. •2-17. Resolve F2 into components along the u and v axes and determine the magnitudes of these components. F1 = 250 N F2 = 150 N 30° и 30° 1050
A box with a uniform mass of 50 kg is supported on a surfaceflat, when a force P is applied to it, as shown in the figure. The coefficient of dynamic friction between the box and the surface is 0.2. Determine the acceleration of the box. Further,confirm that the box is sliding and not tipping.
The upside-down screw jack shown in Fig. often used as a foot leveler on refrigerators and other heavy appliances. Suppose the weight carried by a single foot screw is 800 N and the screw has a mean radius of 3 mm is and a lead of 1 mm. The coefficient of friction is 0.3 be- tween the screw and the refrigerator frame, and friction be- tween the screw head and the floor may be ignored. De- termine the minimum moment necessary to raise and the minimum moment to lower the corner of the refrigerator.
2. A 3.0-m-long ladder leans against a wall at an angle of 60° with respect to the floor. What is the minimum value of us, the coefficient of static friction with the ground, that will prevent the ladder from slipping? Assume that friction between the ladder and the wall is negligible. Center of gravity 19 TULO L 60⁰ Weight acts at the center of gravity. Known L-30 m Find Me Contro <= 0 about this point. Static friction prevents slipping.