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A tantalum rod of diameter 3 mm and length 120 mm is supported by two electrodes within a large vacuum enclosure. Initially the rod is in equilibrium with the electrodes and its surroundings, which arc maintained at 300 K. Suddenly, an electrical current,
(a) Estimate the time required for the midlength of the rod to reach 1000K.
(b) Determine the steady-state temperature distribution and estimate approximately how long it will take to reach this condition.
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Chapter 3 Solutions
Introduction to Heat Transfer
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- Find the resistance at 20°C of an annealed copper bus bar 3 m in length and 0.5 cm by 3 cm in rectangular cross section. (The resistivity of the copper wire is 1.72 x 1042-m). إجابتكarrow_forwardDon't Use Chat GPT Will Upvote And Give Solution In 30 Minutes Pleasearrow_forwardQUESTION Consider a uniformly doped silicon p-n junction at T=300°K. At zero bias, only 40 percent of the total space charge region is to be in the p-region. The built-in potential barrier is 1.2 volts. For zero bias determine total space charge region. (q=1.6x1019, kT/q=0.0259 volts at T=300°K, n=100 cm, e=103.545x104)arrow_forward
- The electric potential difference between the ground and acloud in a particular thunderstorm is 1.2 ( 109 V. In the unitelectron-volts, what is the magnitude of the change in the electricpotential energy of an electron that moves between the groundand the cloud?arrow_forwardYour answer is partially correct. The ammonia molecule NH3 has a permanent electric dipole moment equal to 1.47 D, where 1 D-1 debye unit-3.34 x 10-30 C-m. Calculate the electric potential in volts due to an ammonia molecule at a point 46.7 nm away along the axis of the dipole. (Set V-0 at infinity.) Number 2.26E-5 Units Varrow_forwardDefine the electrical power in terms of resistance R, current I, and potential difference V.arrow_forward
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