Estimate the design-stage uncertainty in determining the voltage drop across an electric heating element. the device has a nominal resistance of 30 ? and power rating of 500 w. available is an ohm meter (accuracy: within 0.5%; resolution: 1 ? ) and ammeter (accuracy: within 0.1 % ; resolution: 100 ma). recall e=ir hint: e=ir or in terms of power, p=pr

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.