Achemical reaction takes place in a container of cross-sectional area 50 cm2. as a result of the reaction, a piston is pushed out through 15 cm against an external pressure of 121 kpa. calculate the work done by the system. (3 sig figs, answer in j) before starting the calculation, be sure to ask yourself whether or not this is a reversible process. question 1 options:

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?