What number is neutrons protons electrons of helium

It was a dark and stormy night, when suddenly you saw a flash of lightning. Three-and-a-half seconds later you heard the thunder. Given that the speed of sound in air is about 340 m/s, how far away was the lightning bolt?

Explain the law of conservation of momentum.

What does keplers second law of planetary monition imply

8) Nuclear reactions do not directly produce electrical energy. Explain the process that is used to create electrical energy. Begin with the forms of energy produced by nuclear reactions.

Moon phases are named after the shape the moon resembles during that time. What is is called when the shape of the moon is between a half circle and a full circle. crescent semi-full three-fourths gibbous

an 100kg object traveling at 50m/s collides (perfectly inelastic) with a 50kg object initially at rest. what is the sum of the momentum of both objects prior to the collision?

A train moves at constant velocity of 50km/h. how far will it move in 0.5h?

Which process best describes part of a scientific investigation? O designing a solution O evaluating the conclusion O evaluating the solution O identifying the conclusion

How many neutrons are in Cesium-130

You are standing outside during the daytime. How can you see a blade of grass? A. Light is produced by your eyes and travels out to the grass. B. Light is produced by the grass and travels straight to your eyes. C.