Four electrons are located at the corners of a square 10.0 nm on a side, with an alpha particle at its midpoint.
how much work is done by the coulomb force when the alpha particle moves to the midpoint of one of the sides of the square?

Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)

Drag each item into the proper state of matter category.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?