Astudent visits the beach during a very hot day. she steps on the sand and jumps because it is so hot. what type of heat transfer is demonstrated by the sand in this example?

Answer is: thermal conductuction.
Thermal conductuction is the transfer of heat through physical contact. Thermal conduction is the transfer of heat by microscopic collisions of particles. Heat spontaneously flows from a hotter to a colder body.
The process of heat conduction depends on four basic factors: the temperature gradient, the cross section of the materials involved, their path length and the properties of those materials.

The gas would begin to expand, and eventually the can would burst or explode.

Yes it would be a physical change.