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Chapter 9: Statics and Torque

Expert-verified
College Physics (Urone)
Pages: 293 - 320
College Physics (Urone)

College Physics (Urone)

Book edition 1st Edition
Author(s) Paul Peter Urone
Pages 1272 pages
ISBN 9781938168000

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Illustration

58 Questions for Chapter 9: Statics and Torque

  1. Suppose you pull a nail at a constant rate using a nail puller as shown inFigure 9.23. Is the nail puller in equilibrium? What if you pull the nail with some acceleration – is the nail puller in equilibrium then? In which case is the force applied to the nail puller larger and why?

    Found on Page 315

  2. A \({\rm{17}}{\rm{.0}}\;{\rm{m}}\)high and \({\rm{11}}{\rm{.0}}\;{\rm{m}}\)long wall under construction and its bracing are shown in Figure \({\rm{9}}{\rm{.32}}\). The wall is in stable equilibrium without the bracing but can pivot at its base. Calculate the force exerted by each of the 10 braces if a strong wind exerts a horizontal force of \({\rm{650}}\;{\rm{N}}\)on each square meter of the wall. Assume that the net force from the wind acts at a height halfway up the wall and that all braces exert equal forces parallel to their lengths. Neglect the thickness of the wall.

    Found on Page 316

  3. Why are the forces exerted on the outside world by the limbs of our bodies usually much smaller than the forces exerted by muscles inside the body?

    Found on Page 315

  4. (a) What force must be exerted by the wind to support a \({\rm{2}}{\rm{.50}}\;{\rm{kg}}\)chicken in the position shown inFigure\({\rm{9}}{\rm{.33}}\)? (b) What is the ratio of this force to the chicken’s weight? (c) Does this support the contention that the chicken has a relatively stable construction?

    Found on Page 316

  5. Explain why the forces in our joints are several times larger than the forces we exert on the outside world with our limbs. Can these forces be even greater than muscle forces (see previous Question)?

    Found on Page 316

  6. Why are the forces exerted on the outside world by the limbs of our bodies usually much smaller than the forces exerted by muscles inside the body?

    Found on Page 315

  7. Suppose a \({\rm{900}}\;{\rm{kg}}\)car is on the bridge inFigure\({\rm{9}}{\rm{.34}}\)with its center of mass halfway between the hinges and the cable attachments. (The bridge is supported by the cables and hinges only.) (a) Find the force in the cables. (b) Find the direction and magnitude of the force exerted by the hinges on the bridge.

    Found on Page 316

  8. Explain why the forces in our joints are several times larger than the forces we exert on the outside world with our limbs. Can these forces be even greater than muscle forces?

    Found on Page 315

  9. A sandwich board advertising sign is constructed as shown inFigure\({\rm{9}}{\rm{.35}}\). The sign’s mass is \({\rm{8}}{\rm{.00}}\;{\rm{kg}}\). (a) Calculate the tension in the chain assuming no friction between the legs and the sidewalk. (b) What force isexerted by each side on the hinge?

    Found on Page 316

  10. Certain types of dinosaurs were bipedal (walked on two legs). What is a good reason that these creatures invariably had long tails if they had long necks?

    Found on Page 315

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