A 8.0 kg box is released from rest on a frictionless ramp. The box slides from the ramp onto a rough
horizontal surface with a friction mk -0.50. The starts at
a height of 4 meters (yo = 4 m).
What is the formula for force friction?
What is the formula for work (W)?
What type of energy does the box have at the begging on this problem?
Where does the energy go after the box come to rest?
What distance d will the box slide?

Adiver named jacques observes a bubble of air rising from the bottom of a lake (where the absolute pressure is 3.50 atm) to the surface (where the pressure is 1.00 atm). the temperature at the bottom is 4.00 ∘c, and the temperature at the surface is 23.0 ∘c.what is the ratio of the volume of the bubble as it reaches the surface (vs) to its volume at the bottom (vb)? if jaques were to hold his breath the air in his lungs would be kept at a constant temperature. would it be safe for jacques to hold his breath while ascending from the bottom of the lake to the surface?