What is the definition of ecosystem?

Relation between wavelength wave velocity and time period

What are four physical changes a candle undergoes when a part of it is broken off?

Why is water And effective solvent for many different types of compounds? A. it contains hydrogen bonds B. it contains polar covalent bonds. C. it has a high specific heat D. it expands when freezing

An object has a momentum of 4,000 kg-m/s and a mass of 115 kg. It crashes into another object that has a mass of 100 kg, and the two objects stick together.

The center of the Milky Way galaxy lies in the direction of the _constellation, aboutlight-years away.

Your friend of mass 50 kg can just barely float in fresh water. Calculate her approximate volume.

A flashlight beam strikes the surface of a pane of glass (n = 1.50) at a 61° angle to the normal. what is the angle of refraction?

Why is there controversy to the opinion that human contribution of carbon dioxide to the atmosphere is cause warming

If the resistance of a circuit increases, that means that the current has to

One watt is equal to which of these values? 1 joule/hour 1 joule-hour 1 joule/second 1 joule-second