Bradley and shane both were chased by Josephine's dog and ran up a set of stairs .In 15 seconds ,Bradley (75kg)runs to a level 10 meters above the ground level while Shane (50kg) runs to a level which is 12 meters above the ground level. You are asked by Josephine to compare Bradley's performance with Shane's performance. What can you say about Bradley's speed and his power compared with Shane's?

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?