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Posted by on Sunday, December 11, 2011 at 6:07pm.

When a rattlesnake strikes, its head accelerates from rest to a speed of 26 m/s in 0.3 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 rattlesnake need to accelerate its head that fast?
Answer in units of W

  • Physics - , Sunday, December 11, 2011 at 6:24pm

    100 g = 0.1 Kg

    power times time = kinetic energy gained

    Ke/t = (1/2) m v^2 /t = (1/2)(0.1)(26)^2/.3

    = 113 Joules/second or Watts

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