Abrick of 203 × 102 × 57 mm in dimension is being burned in a kiln to 1250°c, and then allowed to cool in a room with ambient air temperature of 30°c and convection heat transfer coefficient of 5 w/m2·k. the brick has properties of rho = 1920 kg/m3, cp = 790 j/kg·k, and k = 0.90 w/m·k. calculate the time required to cool a brick from 1250°c to a temperature difference of 5°c from the ambient air temperature. (round the answer to 2 decimal places.) 7.18 ± 5% hours.

Which force is most responsible for binding together an atom's protons and neutrons? electrostatic gravitational nuclear magnetic

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.