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 4.0 ∘c, and the temperature at the surface is 23.0 ∘c.
a. what is the ratio of the volume of the bubble as it reaches the surface (vs) to its volume at the bottom (vb)?
b. would it be safe for jacques to hold his breath while ascending from the bottom of the lake to the surface?

Current enters a circuit at a: 1.positive terminal 2.negative terminal 3.low potential side 4.resistor

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration