"your friend has a job as a pizza delivery person. she carries a few pizzas, weighing 20 n, up four flights of stairs , a height of 30 m. how much work does she do? " if you could explain how to do this that would be great!

What is the internal energy of 4.00 mol of diatomic nitrogen gas n2 at 455k

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

Which best describes what forms in nuclear fission? a. two smaller, more stable nucleib. two larger, less stable nucleic. one smaller, less stable nucleusd. one larger, more stable nucleus