The largest tendon in the body, the achilles tendon connects the calf muscle to the heel bone of the foot. this tendon is typically 25.0 cm long, is 5.0 mm in diameter, and has a young’s modulus of 1.47×109 n/m2 . if an athlete has stretched the tendon to a length of 26.1 cm, what is the tension (in newtons and pounds) in the tendon?

1269.98883 N or 285.51907 lbf

Explanation:

L = Length of tendon = 25 cm

= Change in tendon length

r = Radius of tendon = 5/2 = 2.5 mm = 0.0025 m

A = Area =

T = Tension

Y = Young's modulus =

Young's modulus is given by

Converting to lbf

The tension in the tendons is 1269.98883 N or 285.51907 lbf

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.