Which question should Trudy write

Energy moves through an ecosystem, is known as a a. habitat. c. food net. b. food chain. d. food web.

The main reason that most professional research telescopes are reflectors is that

Why do scientists think that our solar system must have formed sometime after nearby supernovae explosions?

An unknown noise is generated in a building. Sound waves move toward an open doorway. Waves of which wavelength would diffract the least through the doorway and spread into the room? 15 centimeters 1 meter 5 meters 12.5 meters

Density is - -- - Through the world's ocean

Explaining how momentum can cause motion an astronaut on a space walk floats a little too far away from the space station. without air to push against, he cannot paddle back. however, the astronaut is holding a hammer.

A one-piece cylinder has a core section protruding from the larger drum and is free to rotate around its central axis. A rope wrapped around the drum of radius 1.39 m exerts a force of 3.34 N to the right on the cylinder.

In which of the following situations or places would you want to reduce the force of friction? More than one answer A. Skiing down a hill during a race. B. Walking down a steep hill. C. Sitting in the bed of a pickup truck while it turns a corner. D.

What are five examples that illustrate a machine or a person doing work on another?

An aerophone is an instrument that causes what to vibrate