PLEASE HELP OMG PLEASE Calculate the atomic mass for an atom with 19 protons,
20 neutrons, and 19 electrons. Show your work on the
whiteboard.

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

Aman applies a force of 500n to push a truck 100m down the street how much does he do?

Plz a person walks 1 mile every day for exercise, leaving her front porch at 9 am and returning to her front porch at 9: 25 am what was the total displacement of her daily walk a. 1 mile b. 0 c. 25 min d. none of the above