If element X has 31 protons, how many electrons does it have?

Which process is a cause of variation in a species?

A man hits a golf ball (0.2 kg) which accelerates at a rate of 20 m/s2. What amount of force acted on the ball?

Define the phenomena

A boy jumps on his bed when his feet push the bed down what is the reaction force

A ham radio operator broadcasts at a frequency of 3.0 * 108 Hz. The speed of an electromagnetic wave is a constant, 3.0 * 108 m/s. What is the wavelength? 6.0 m 9.0 m 1.0 m 0.1 m

Compare the acceleration of a motorcycle that accelerates from 80 km/h to 90 km/h

Do you think you would like to do arson or explosion investigation or evidence testing? Why or why not?

What's the difference between solids and liquids?

Which type of reaction will for a chemical bonded combination

What kind of change is salt dissolving in water