Explain the following observations: i) Water wets glass surface but does not wet the waxed glass surface.
ii) A steel needle placed carefully on the surface of water does not sink.
iii) A matchstick rubbed at one end with soap starts moving immediately in one direction when placed on the surface of water.
iv) The mass of a lump of goodies constant everywhre, but it'd weight is not.
v) Large mercury drops from oval balls on a glass slide

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

The total amount of energy contained in an object

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?