What causes the displays of lights called auroras? ?

You notice a very one-dimensional-thinking snail crawling along one rail of a railroad track. naturally, you remove it to a safer place. but before you do, you observe it as it moves from position xi = -92.9 cm to position xf = -64.9 cm along the rail, as measured from a point where one rail abuts the next. what is the snail\'s displacement δx in centimeters?

Determine el momento angular de un rueda de 3000g moviendose a 10m/s con un radio de giro de 400cm

What is a subatomic particle with a negative charge and very little mass?