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 1650°C, how much power will the hole radiate? A) 20 W
B) 30 W
C) 40 W
D) 50 W
C
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Indicate whether the statement is true or false
Two parallel wires are separated by 0.36 m. Wire A carries 4.8 A and Wire B carries 8.9 A, both currents in the same direction. The force on 0.53 m of Wire A is:
a. 1.3E–5 N. b. 4.5E–5 N. c. 2.6E–6 N. d. 1.4E–6 N. e. 4.0E–5 N.
On an average diet, the consumption of 10.6 liters of oxygen releases how much energy? (4.50 kcal are released per liter of oxygen consumed.)
a. 45 kJ b. 199 kJ c. 44.3 kJ d. 4 430 kJ e. 399 kJ
The magnitude of the magnetic force on a charge depends on
A. the velocity component perpendicular to the magnetic field. B. the magnitude of the charge. C. the magnitude of the magnetic field. D. the sign of the charge. E. Three of the items are correct.