We are barefoot and we go to our yard outside. The temperature outside has been 0 °C  all day long. With our left foot, we step on a floor tile made of fused silica (SiO2), and with our right foot, we step on a floor tile made of Polystyrene. Which foot will feel colder?Hint! We feel cold when our body heat is absorbed by a material or the environment quickly. Kysymys 4Valitse yksi:a.Both feet will feel equally cold b.Leftc.Right

Why?Kysymys 5Valitse yksi:a.The temperature for both tiles is the same and this is why our feet will feel equally cold.b.Polystyrene has a larger thermal conductivity than fused silica (SiO2)  and cools (or absorbs heat from) our left foot faster.c.Fused silica (SiO2) has a larger thermal conductivity than polystyrene and cools (or absorbs heat from) our left foot faster.

Explain why your feet feel colder on marble floor than on wooden floor.

When standing barefoot on a floor, body heat is transferred into the floor based on the thermal conductivity k of the flooring material.  The heat flow rate per unit area H is defined by:H=kΔTL𝐻=𝑘Δ𝑇𝐿where ΔT is the difference in temperature over a distance L.  The tiled part of a floor in a room at room temperature feels colder than the carpeted part because:A.the temperature of the tile is lower than the temperature of the carpet.B.the thermal conductivity of the tile is higher than the thermal conductivity of the carpet.C.the thermal conductivity of the tile is lower than the thermal conductivity of the carpet.D.heat travels a greater distance through the carpet.Submit

A marble tile would feel cold as compared to a wooden tile on a winter morning, because the marble tile

Why do your feet burn when you walk across beach sand on a sunny summer day?A.Heat is transferred by radiation warming.B.Heat is transferred by thermal conduction.C.Heat is transferred by frictional heating.D.Heat is transferred by convection heating.SUBMITarrow_backPREVIOUS