The quadriceps tendon passes over the kneecap and presses on the temur. The tension in the tendon is F = 1000 N. What is the magnitude of the resultant force of the kneecap acting on the femur for the angles as shown in the diagram (to the nearest 100 N)? Kneecap 70

Problem 7: Two muscles in the back of the leg pull upward on the Achilles tendon, as F,(200 N) F,(200 N) shown in the figure. (These muscles are called the medial and lateral heads of the gastrocnemius muscle.) 20 20 Find the magnitude, in newtons, of the total force on the Achilles tendon. F =

1 b F2 1 1 FR F1 b. The figure above shows a crane tower on site at the HWY 1 expansion and Stoney Trail extension in NW Calgary. You are a design engineer working for the company supplying cranes for the contractors and you have been asked to evaluate the tower design. The crane tower supporting the pulley is designed so that the resultant force from the cable tension running over the pulley is oriented along the tower axis. Note: The tension in the cable is the same on both sides so ||Fill = ||F2l|| = T.

. A person can “ walk on water “ if she has the proper shoes. Assume that you use expanded polystyrene (ρ = 0.40 g/cm3 ) to construct two blocks that you will strap to your feet, with a cross section of 850 cm2 . How long will each block need to be in order to support a 65 kg person? dont provide handwritten solution

There is a disk of cartilage between each pair of vertebrae in your spine. Young’s modulus for cartilage is 1.0x10^6 N/m^2. Suppose a relaxed disk is 4.0 cm in diameter and 5.0 mm thick. If a disk in the lower spine supports half the weight of a 74 kg person, by how many mm does the disk compress?

3. A biomechanical model of the lumbar region of the human trunk is shown. The forces acting in the four muscle groups consist of $F_R=35 \mathrm{~N}$ for the rectus, $F_O=45 \mathrm{~N}$ for the oblique, $F_L=23 \mathrm{~N}$ for lie lumbar latissimus dorsi and $F_E=32 \mathrm{~N}$ for the erector spinae. These loadings are symmetric with respect to the $y-z$ plane. Determine the resultant force equivalent to the given parallel force system and locate its point of application $(x, y)$ on the trunk.

The “lead” in pencils is a graphite composition with Young’s modulus of approximately 1.0×109 N/m2. Calculate the change in length of the lead in an automatic pencil if you tap it straight into the pencil with a force of 6.8 N. The lead is 0.52 mm in diameter and 80 mm long.   Round your answer to 5 decimal places.

A person places his hand palm downward on a scale and pushes down on the scale until it reads 96.0 N. The triceps muscle is responsible for this arm extension force. Find the force exerted by the triceps muscle. The bottom of the triceps muscle is 2.50 cm to the left of the elbow joint, and the palm is pushing at approximately 29.0 cm to the right of the elbow joint. P 96.0 N 2.50 cm and Q = 29.0 cm. where P =

A 5 N uniform wooden plank is supported by two posts that are 1.2 m apart. A 4 N load is hung 0.3 m from one post. Find the magnitude of the force exerted by each post. 0.3 m +4 N 5 N 1.2 m

Two rods, one made of copper and the other of steel, have the same dimensions. If the copper rod stretches by 0.15 mm under some stress, how much does the steel rod stretch under the same stress?