Pressure a vertical piston cylinder device contains a gas at an unknown pressure. if the outside pressure is 100 kpa, determine (a) the pressure of the gas if the piston has an area of 0.2 m2 and a mass of 20kg. assume g = 9.81 m/s2. (b) what-if scenario: what would the pressure be if the orientation of the device were changed and it were now upside down

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

What changes occur in the brain during the teenage years? 25 points, someone me out!a.) thinking becomes slower as the brain grows larger. b.) connections between neurons become stronger and faster. c.) unused neurons fuse together to form larger, better functioning neurons. d.) more neurons are developed.

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)