A chemistry teacher owns 50 bowling balls. 25 of the bowling balls have a weight of 16 pounds, 10 of them have a weight of 15 pounds, and the last 15 have a weight of 14 pounds. What is the average weight of the 50 bowling balls? (type all of your work and label the correct unit) *

What is the force of attraction between the particles in a salt crystal

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?