For the following systems, determine whether the system described is best modeled as an isolated, closed, or open system.
(a) a pulley on an elevator
(b) a bathtub
(c) a human being
(d) a piece of metal being shaped on a lathe
(e) a comet orbiting the Sun in the Oort cloud (the cloud of inactive comets located well beyond the orbits of the planets.)
(a) Closed System
(b) Open System if being filled or emptied. If it is just sitting as an empty bathtub, it is a closed system.
(c) Open System
(d) Open System
(e) Isolated System
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