Would a planet of radius 3.0 x 10^5 m and mean density 4.0 x 10 kg/m^3 be able to keep nitrogen in its atmosphere if the mean temperature were 700 K?​

Asubmarine has a "crush depth" (that is, the depth at which water pressure will crush the submarine) of 250 m. what is the approximate pressure (water plus atmospheric) at this depth? (recall that the density of seawater is 1025 kg/m3, g = 9.81 m/s2, and 1 kg/(ms2) = 1 pa = 9.8692 10-6 atm.) a. 34.8 atm b. 24.8 atm c. 25.8 atm d. 7.8 atm

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

What object a collides with object b and bounces back its final momentum is?