Hristina and Richard are building a wooden raft from logs. Each log is 3 meters long and has a diameter of 16 cm, how many logs would they need to just barely float them? Assume the combined mass of Hristina and Richard is 121, and the density of wood is 0.720 g/cm3.

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.

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?

The radius of an atom is closest in size to a