In an electric furnace used for refining steel, the temperature is monitored by measuring the radiant power emitted through a small hole in the wall of the furnace, of area 0.5 cm2.
This hole acts like a perfect blackbody radiator having the same temperature as the interior of the furnace. If the temperature of the furnace (and therefore of the hole) is to be maintained at 1650C, how much power will the hole radiate? A) 20 W
B) 30 W
C) 40 W
D) 50 W
Question 2
An ideal parallel-plate capacitor consists of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery and charged until its plates carry charges +Q and -Q, and the battery is then disconnected.
If the separation between the plates is now doubled, the electrical energy stored in the capacitor will A) double.
B) quadruple.
C) be cut in half.
D) be cut in fourth.
E) not change.
Use of the tympanic thermometer to measure body temperature.
The effective temperature, or black body temperature, of the Sun (5777 K) is the temperature a black
Use caution if using a steel scraper to remove a gasket from aluminum parts. It is best to use a ...
A typical direct-injection system uses two pumps—one low-pressure electric pump in the fuel tank ...
Correlates well with global temperature prior to the impact of GHG emissions
A rise in global temperature of more than 3˚C