When a rattlesnake strikes, its head accelerates from rest to a speed of 21 m/s in 0.5 seconds. Assume for simplicity that the only moving part of the snake is its head of mass 180 g. How much (average) power does the rattlesnake need to accelerate its head that fast? Answer in units of W.

The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.