posted by Mike on .
When a rattlesnake strikes, its head accelerates from rest to a speed of 30 m/s in 0.64 s seconds. Assume for simplicity that the only moving part of the snake is its head of mass 100 g. How much (average) power does the rat-
tlesnake need to accelerate its head that fast?
Answer in units of W
a = (30 - 0)m/s / 0.64s = 46.88m/s^2.
Fs = mg = 0.1kg * 9.8N/kg = 0.98N @ 0 deg = Force of snake.
d=0.5at^2=0.5 * 46.88 * (0.64)^2=9.60m.
P=F * d/t = 0.98 * (9.6/0.64) = 14.7W.