Question

Fill the ice mold with tap water and put it in a freezer for 24 hours. Remove the

mold from the freezer, loosen the ice but do not remove the ice and place the mold upside

down in a thin paper plate and place the plate on a thick coffee table or dining table (see

Figure 1). Wait for about 30 minutes, using the cell-phone or digital watch as a timer, and

then measure the amount of water in the plate (melted ice) using measuring cup/spoon,

kitchen balance, or a syringe. If the amount of water was too small, wait an additional 10 or

20 minutes. The amount of heat transferred to the ice, which can be calculated by measuring

the amount of melted ice and time, is equal to the amount of heat that was transferred from

the table to the ice. Use the proper equation for heat transfer from a semi-infinite body with

constant surface temperature to estimate the conductivity of the tabletop

Melted ice = 50 ml

time = 30 min

Answer 1