A child pulling a wagon across the grass but friction between the grass and wheel creates a force in the opposite direction. If the wagon is speeding up, what does that mean about the two forces?

What is the relationship between the wavelength of a wave and it's energy?

An observer that stands still as the electron moves by him, will observe

Animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. reactivate d) a dog is getting hot in the sunlight, so he moves to a shaded area.