When x rays are passed through successive aluminium sheets, their hardness ___. a. decreases
b. increases
c. remains constant​

Protons and neutrons are found within the nucleus of an atom

An alien spaceship is 500 m above the ground and moving at a constant velocity of 150 m/s upwards. how high above the ground is the ship after 5 seconds?

You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked