Which is not an era of the Phanerozoic eon

What forces were acting on the objects dropped in the air? What forces act when dropped in a vacuum?

Most of the symbols used to indicate elements are from an elements name in which language

If an electron is released from rest in a uniform electric field, the electric potential energy of the charge-field system does what?

Why does Earth's moon have no atmosphere? A. The average temperature is too high. B. There are no plants to release oxygen. C. The moon is too far away from Earth.' D. The moon's gravity is too weak t hold onto gas molecules

Which of the following are relative? A. Time only B. Time, length, and mass C. Time and mass D. Time and length

Through which type of material does sound tend to travel at the highest speed? A. Sound travels at the same speed in every material B. Solids D. Liquids

How does a low pressure system determine the weather in an area?

Molecules at room temperature move freely. What happens to the molecules when heat is removed until it freezes? Molecules group together Molecules slow down and contract Molecules speed up and expand Molecules move freely

A spring is used in a lab. It is vibrated at different frequencies and the wavelength is recorded. Using the graph of the data, what is the relationship found between frequency and wavelength? A) Frequency and wavelength are inversely related.

How do you describe the frequency of waves perceived by the observer from the moment the source appears to the moment it disappears?