If element x has 51 protons, how many electrons does it have?

What is the critical angle for light going from crown glass to air?

A 1423 kg car is traveling down the road at 105.0 km/h. while traveling at this rate of speed, what is the kinetic energy of this vehicle in kilojoules?

Which property of a filled balloon will be unchanged on the moon where there's no air and less gravity? A) mass B) weight C) volume D) density

Strength of electromagnets

The speed of sound in air is about 340 meters per second. You see a flash of lightning, then hear the thunder 9 seconds later. Calculate the distance between you and the storm in meters, then convert to kilometers.

How is Electric current able to flow?

In a series circuit, loads which have the same voltage dropped across them will have?.

When a brick is dropped from the roof of a house, it lands on the ground with a speed v. What will the speed at ground level be for an identical brick dropped from a roof twice as high as the first one?

The scientific method begins with recognizing a problem. The recognized problem in this scenario is, "Why is the printer in the office not working?" Choose the hypotheses that are testable and from which an experiment can be formed.

The correctly balanced equation for H2O2 → H2O + O2 is