Acylinder with a piston contains 0.200 mol of oxygen at 2.00×105 pa and 360 k . the oxygen may be treated as an ideal gas. the gas first expands isobarically to twice its original volume. it is then compressed isothermally back to its original volume, and finally it is cooled isochorically to its original pressure. part afind the work done by the gas during the initial expansion. w initial = jpart bfind the heat added to the gas during the initial expansion. q initial = jpart cfind internal-energy change of the gas during the initial expansion.δu initial = jpart dfind the work done during the final cooling; w final = j

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.