Why must the substance be stirred as it heats or cools?

Describes how rapidly a wave oscillates

Why does an empty plate not heat up in the microwave?

Which one of the following light bulb produces lowest lumens per watt? A) Incandescent B) Fluorescent C) Compact fluorescent light D) Low pressure sodium

A magnesium (Mg) atom has 2 valence electrons. Which of the following would be the most likely way for a magnesium atom to become stable? O A. Lose 2 electrons O B. Lose 1 electron O C. Gain 6 electrons O D. Gain 1 electron

As light from air to water to glass, it will refract. The best explanation for this would be A) Glass is less transparent than water, which is less transparent than air.

Which represents a system that is almost completely closed?

If many household substances classify as acids or bases what is the ph scale

A protostar forms once the nebular cloud condenses and the core begins

How do whales bats and dolphins use echolocation? A To scare away predators B To attract mates C To orient them selves and find food D To tell animals of there species where they are

How much force would be needed to move a car with the mass of 100kg to an acceleration of 5m/s/s?