A block slides from rest a distance d=5.0m down a 30° frictionless incline and then a distance d2 along a rough horizontal track before it stops (see figure blow). The coefficient of kinetic friction between the block and horizontal track is 4x =0.45. What is the distance d»?

Awelder using a tank of volume 7.50×10^-2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of 3.30×10^5 pa and temperature of 37.1 ∘c. the tank has a small leak, and in time some of the oxygen leaks out. on a day when the temperature is 23.1 ∘c, the gauge pressure of the oxygen in the tank is 2.00×10^5 pa . a) find the initial mass of oxygen. b) find the mass of oxygen that has leaked out.