Describe how the doppler effect explains why an approaching fire engine's siren has a high pitch?

The product of an object's mass and velocity

A student hypothesizes that since elements in the same row have the same number of energy levels, they should behave the same in chemical reactions. Explain why you agree or disagree with this hypothesis.

Neutralization is an important part of digestion. Why?

Before the invention of a wheel turning on an axle, ancient people moved heavy loads by placing rollers under them. (Modern people use rollers, too. Any hardware store will sell you a roller bearing for a lazy susan.

Under the doppler effect, if the source of a wave is moving, it must be changing the frequency of the wave. true false

Describe and explain the motion of a small ball floating on a pond when waves travel across the pond

Describe how the doppler effect explains why an approaching fire engine's siren has a high pitch?

How does the effect of poison on lions and hyenas compare to the effect of poison on vultures

Which simple machine belongs to the inclined plane family

How should science advance?