What is the main way that scientists determine which conditions can support life

In a certain region of space, the electric field is zero. from this fact, what can you conclude about the electric potential in this region?

Why do people love sports? Why do they participate in sports? What has sports given back to people?

When objects exchange charge, why do we say it's the negative charge that moves and not the positive?

If the pulley was not set so that the string was parallel to the track, what effect would this have on the acceleration of the system? what effect would this have on the normal force from the track? would this be a random or systematic error?

A compound containing sodium and chlorine in a binary ionic compound would be named

What trends were seen in Mendeleev's periodic table?

Through which medium would EM waves travel the fastest? A. The Ocean B. The Atmosphere C. Rocks

Average mass of a toy car (small, hot wheels) ?

A cannon directed straight upward launches a ball with an initial speed v. The ball reaches a maximum height h in a time t. Then, the same cannon is used to launch a second ball straight upward at a speed 2v.

Does the sun fuse hydrogen into helium or vice versa?