# Oom Lecture 13

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Jump to navigationJump to search### Land Transport

We can calculate the length of an animals heart-rate:

And in fact, the total number of heartbeats in a lifetime is independent of mass (). This tells us that

This is only for mammals.\We also have the elastic similarity (which says that the radius of the bone of a creature is related to the length of the creature):

This gives us Then using that muscle strain goes as:

And muscle stress is:

We also use:

where is the trot-gallop transition.

We can also use:

Assuming when we are running our feet are actually rolling without slipping over the ground, we have: