Acube of aluminum floats in a container partially filled with mercury (a) both the aluminum and mercury are at 20.0 c. what fraction of the cube is above the surface of the mercury? (numeric answer.) (b) the temperature of both the aluminum and the mereury is raised to 350 °c. what fraction of the cube is above the surface of a mercury? (numeric answer. (c) if the aluminum cube were 0.01 m on a side when the temperature is 20.0 °c, what is the length of one side after the temperature has been raised to 350 °c? (numeric answer)

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.