Biology & Medicine

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Nerve Impulses

Keywords: nerve impulses, neurons, reaction time

How fast does a nerve signal travel?

This example takes typical eye-hand and eye-foot reaction times and calculates the average speed at which a signal travels along the nervous system. Why are eye-foot and eye-hand reaction times different?

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6 years 48 weeks ago

Cheetah Chase

Keywords: constant acceleration, displacement, kinematics, uniform motion, velocity

How far away can a cheetah be from a gazelle and still be guaranteed to catch it?

This example combines both constant acceleration and uniform motion to determine the maximum distance that a gazelle can be away from a cheetah for the cheetah to have a chance of catching the gazelle.

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6 years 48 weeks ago

Bats and the Doppler Shift

Keywords: bats, Doppler shift compensation, echolocation

What compensation for doppler shifts do bats perform to keep their echoes within their hearing range?

This example investigates the compensation for Doppler shifts bats perform to keep their echoes within their range of maximal hearing sensitivity.

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6 years 48 weeks ago

Falling Cats

Keywords: drag force, terminal velocity

Why does your cat have a better chance of surviving a fall from a large cliff than you do?

This example incorporates air resistance into free fall to derive the terminal velocity reached. The terminal velocities and physiology of cats and humans are compared.

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6 years 48 weeks ago

Bicycling and Calories

Keywords: air drag, conservation of energy, energy transfers, metabolic efficiency, rolling friction, work done

How long do you have to ride your bicycle to burn off a doughnut?

This example looks at the relationship between physical exercise and calorie consumption.

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6 years 48 weeks ago
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