posted by .

When you stand on your tiptoes, your feet pivot about your ankle. As shown in the figure, the forces on your foot are an upward force on your toes from the floor, a downward force on your ankle from the lower leg bone, and an upward force on the heel of your foot from your Achilles tendon. Suppose a 61 woman stands on tiptoes with the sole of her foot making a 25 angle with the floor. Assume that each foot supports half her weight.
Sorry I can't add a picture to this b/c cramster doesn't have my book but....
From the toe to the ankle pivot is 15cm and from the toe to the Achillies tendon it is 20cm.

a)What upward force does the Achilles tendon exert on the heel of her foot N?
b)The tension in the Achilles tendon will cause it to stretch. If the Achilles tendon is 15 long and has a cross-section area of 110 , by how much will it stretch under this force?

  • physics -

    Many of your numbers require dimensions. For example, what do you mean by "a 61 woman"?

  • physics -


  • physics -


Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    A non-uniform beam of length L and weight w makes an angle of รจ with the horizontal. It is held in position by a frictionless pivot at its upper-right end and by a cable a distance of farther down the beam and perpendicular to it. …
  2. AP Physics - Equilibrium

    The Achilles tendon is attached to the rear of the foot as shown in the figure below. When a person elevates himself just barely off the floor on the ball of one foot, estimate the tension Ft in the Achilles tendon (pulling upward) …
  3. Physics

    A chain composed of four identical links is suspended by a rope and does not move. How many force vectors would be drawn on the free body diagram of each link and which direction would they point?
  4. physics

    When a person stands on tiptoe (a strenuous position), the position of the foot is as shown in Figure P8.16a. The total gravitational force on the body, Fg, is supported by the force n exerted by the floor on the toes of one foot. …
  5. physics

    A man doing push-ups pauses in the position shown in the figure . His mass m = 80 kg. In push up position: From hands to waist = 40 cm From waist to feet = 95 cm height - heel of foot to ground = 30 cm Determine the normal force exerted …
  6. physics

    An elevator is being lifted up an elevator shaft at a constant speed by a steel cable. All fricional effects are negligible. In this situation,forces on the elevator are such that?
  7. physics

    Severe stresses can be produced in the joints by jogging on hard surfaces or with insufficiently padded shoes.If the downward velocity of the leg is 7.3m/s when the joggers foot hits the ground. If the leg stops in a distance of 1.1 …
  8. College Physics

    PLEASE HELP. DUE TOMORROW A large box 4.5 m on a side has mass 90 kg. A force F is applied as shown, making an angle θ = 35 with respect to the vertical. How large must the force be to tip the box about the pivot point P?
  9. Physics

    The Achilles tendon is attached to the rear of the foot as shown in (Figure 1) . A person elevates himself just barely off the floor on the "ball of one foot." Assume the person has a mass of 65kg and D is twice as long as d. Find …
  10. Physics

    Three forces are exerted on an object placed on a tilted floor. Forces are vectors. The three forces are directed as shown in the figure. If the forces have magnitudes F1 = 2.0 N, F2 = 17.0 N and F3 = 15.0 N, where N is the standard …

More Similar Questions