Tiles is a better conductor of thermal energy than parquet. The tiles will conduct thermal energy from the feet faster than the parquet.
Heat the ring up. Diameter A will increase. When the ring is heated, it will expand outwards, causing diameter a to increase. As the outer surface of the ring expands outwards, the inner surface will expand outwards, following the outer surface. Thus, the hole will be bigger for the ball to pass through.
We are hotter than the air conditioned room. As thermal energy flows from a hotter region to a colder region, thermal energy is transferred from our body to the air conditioned room. In addition, the sweat that remained on our skin will lose heat and evaporate into water vapour. Thus, we will feel cold when we enter an air conditioned room after work on a hot day.
My Individual Answer:
We shiver because we lose more thermal energy in a short period of time. When we get out of the swimming pool, water droplets remain on our skin. They will evaporate, changing its state from liquid to gas. Thus, we shiver because the water changed its state.