In addition to the spin-orbit and kinematic corrections, there is a third relativistic correction term to the hamiltonian of the hydrogen atom due to the relativistic correction of the potential energy, "darwin term", defined as e2 5(7) 2m2c24tte tuh2 h' calculate the first-order energy shift due to this term, and explain in words your method of calculation (hint: you only have to consider the /= 0 case, and the darwin term commutes with l2, l7, and s2,

There are weak or strong attractive forces between atoms of liquids with a high viscosity

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?

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.