6a single sheet of aluminium foil is folded twice to produce a stack of four sheets. the total
thickness of the stack of sheets is measured to be (0.80 ± 0.02) mm. this measurement is made
using a digital caliper with a zero error of (−0.20 ± 0.02) mm.
what is the percentage uncertainty in the calculated thickness of a single sheet?

a 1.0% b 2.0% c 4.0% d 6.7%

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?