![Fundamentals of Physics, Volume 1, Chapter 1-20](https://www.bartleby.com/isbn_cover_images/9781118233764/9781118233764_largeCoverImage.gif)
Concept explainers
Figure 12-85a shows details of a finger in the crimp hold of the climber in Fig. 12-50. A tendon that runs from muscles in the forearm is attached to the far bone in the finger. Along the way, the tendon runs through several guiding sheaths called pulleys. The A2 pulley is attached to the first finger bone; the A4 pulley is attached to the second finger bone. To pull the finger toward the palm, the forearm muscles pull the tendon through the pulleys, much like strings on a marionette can be pulled to move parts of the marionette. Figure 12-85b is a simplified diagram of the second finger bone, which has length d. The tendon’s pull
Figure 12.85 Problem 85.
![Check Mark](/static/check-mark.png)
Want to see the full answer?
Check out a sample textbook solution![Blurred answer](/static/blurred-answer.jpg)
Chapter 12 Solutions
Fundamentals of Physics, Volume 1, Chapter 1-20
Additional Science Textbook Solutions
Glencoe Physical Science 2012 Student Edition (Glencoe Science) (McGraw-Hill Education)
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
Essential University Physics: Volume 1 (3rd Edition)
Lecture- Tutorials for Introductory Astronomy
- (b) A heavy uniform rod AB of weight W is hinged at A to a fixed point. It is pulled aside by a horizontal force P so that it rests inclined at an angle 0 to the vertical. Show that (i) the magnitude of the force Pis 1-cos2e W 2V 1-sin24 (ii) the reaction at the hinge is V3+ sec*0arrow_forward11-30 Two blocks are suspended on a continuous inex- tensible cord as shown in Fig. P11-30. Determine the angle O for equilibrium if the masses of blocks A and B are 50 and 40 kg, respectively. Fig. P11-30arrow_forwardAs part of an engineering design, a load of mass M2=10 kg is to be suspended from the far end of a beam of mass M1=8kg. A horizontal cable supporting the beam attaches to the beam at a distance of d=2m from a joint/hinge. The length of the beam is L=7m. The beam makes an angle of 55 degrees with the horizontal. M, 2 a. What magnitude of force should the cable be able to withstand in this setup? b. What magnitude of force should the joint/hinge be able to withstand in this setup?arrow_forward
- The triceps muscle at the back of her upper arm has an effective lever arm of 1.75 cm, and she exerts force on the floor at a horizontal distance of 20.0 cm from the elbow joint. Calculate the magnitude of the force in each triceps muscle, and compare it to her weight.arrow_forward51 A bowler holds a bowling ball (M =7.6 kg) in the palm of his hand (Fig. 12-52). His upper arm is vertical; his lower arm (1.9 kg) is horizontal. What is the magnitude of (a) the force of the biceps muscle on the lower arm and (b) the force between the bony structures at the elbow contact point? %3Darrow_forwardThere is a small but appreciable amount of elastic hysteresis in the large tendon at the back of a horse’s leg. Explain how this can cause damage to the tendon if a horse runs too hard for too long a time.arrow_forward
- Structural member AB is to be supported by a strut CD. Determine the smallest length CD may have, and specify where D must be located for a strut of this length to be used. Take x= 120 mm. 60 mm D. y 20 mm E The smallest length CD may have is mm. The coordinates of point Dare ( and Imm.arrow_forwardA rigid bar of mass M is supported symmetrically by three wires each of length l. Those at each end are ofcopper and the middle one is of iron. The ratio of their diameter, if each is to have the same tension, is equal to (a)YcopperYiron(b) √YironY copper(c)Yiron2Ycopper2(d)YironYcopperarrow_forwardA particular human hair has a Young's modulus of 3.63×109 N/m2 and a diameter of 145 μm. If a 228 g object is suspended by the single strand of hair that is originally 20.0 cm long, by how much Δ? hairΔL hair will the hair stretch? If the same object were hung from an aluminum wire of the same dimensions as the hair, by how much Δ?AlΔLAl would the aluminum stretch? If the strand of hair is modeled as a spring, what is its spring constant ?hair?khair?arrow_forward
- A particular human hair has a Young's modulus of 3.51 x 10° N/m² and a diameter of 152 µm. If a 209 g object is suspended by the single strand of hair that is originally 19.5 cm long, by how much AL hair will the hair stretch? If the same object were hung from an aluminum wire of the same dimensions as the hair, by how much ALAI would the aluminum stretch? If the strand of hair is modeled as a spring, what is its spring constant khair? AL hair ALAI = Khair 11 6.82 x10-3 Incorrect 3.66 X10-4 Incorrect 372.6 Incorrect m m N/marrow_forwardIn the figure, one end of a uniform beam of weight 110 N is hinged to a wall; the other end is supported by a wire that makes angles 0 = 31° with both wall and beam. Find (a) the tension in the wire and the (b) horizontal and (c) vertical components of the force of the hinge on the beam. (a) Number (b) Number Mo (c) Number i Units Units Units Hinge 6 <arrow_forwardThe bones of the forearm (radius and ulna) are hinged to the humerus at the elbow. The biceps muscle connects to the bones of the forearm about 2.15 cm beyond the joint. Biceps muscle Assume the forearm has a mass of 2.25 kg and a length of 0.425 m. When the humerus and the biceps are nearly vertical and the forearm is horizontal, if a person wishes to Humerus hold an object of mass 6.55 kg so that her forearm remains motionless, what is the force exerted by the biceps muscle? Radius Elbow. Ulna force: N Handarrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
![Text book image](https://www.bartleby.com/isbn_cover_images/9781133939146/9781133939146_smallCoverImage.gif)