The cylindrical filament in a light bulb has a diameter of 0.050 mm, an emissivity of 1.0, and a temperature of 3000°C. How long should the filament be in order to radiate 60 W of power? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 7.2 cm B) 8.6 cm C) 9.4 cm D) 5.9 cm E) 11 cm
D
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The increase in strength due to solid-solution strengthening is proportional to the _________ power of the atom fraction of solute atoms.
Fill in the blank(s) with the appropriate word(s).
_____ says that the total mass of a star must equal the sum of the masses of its shells
A) The law of conservation of mass B) The law of mass action C) Fick's first law of mass transfer D) Newton's law of mass accumulation
Terminal Voltage and Internal Resistance: You buy a AA battery in the store, and it is marked 1.5 V. If this marking is strictly accurate, while this battery is fresh
A. its terminal voltage will be more than 1.5 V when it is used in a circuit. B. its terminal voltage will be less than 1.5 V when it is used in a circuit. C. its terminal voltage will be 1.5 V when it is used in a circuit.
Neglecting friction, a small ball and a similar large ball, at rest, are allowed to roll down an incline. for only one second. At this instant, the large ball will have a greater
A) potential energy. B) kinetic energy. C) speed. D) all of the above E) impossible to predict with the information given