Why did Sienna shift her position on the gymnasium
floor?
Sienna is at soccer practice. She has just finished
running two miles, and is very warm. The temperature
outside is 95°F, and Sienna is beginning to feel
overheated. Her coach takes her into the gymnasium and
tells her to sit down on the floor and relax for a few
minutes. Sienna notices that the floor feels cool against
her skin. After a few minutes, however, the gymnasium
floor no longer feels cool, and Sienna has to shift to a
different part of the floor.
Thermal energy was transferred from the
gymnasium floor to her skin.
Her skin and the gymnasium floor reached thermal
equilibrium.
Thermal energy was transferred from the air to her
skin.
Her skin and the surrounding air reached thermal
equilibrium.