[考古] 中原考古題幾題
_ _ ^ _
1.若空間任意點電場B=Ar x k 其中r是該點的位置向量,A是個常數,則經過一個位於xy平面,
以原點為中心,半徑為R的圓圈的淨電流為?
2.若一平面電磁波電場振幅為100V/m,則其電廠振幅為?T
3.總質量為M的火箭,以30度仰角發射,初速V射出,達最高點時與發射原點的水平距離
為D,並於最高點分成2個等質量的部份,其中一部份自由落下,請問另一部份落地時,
與發射點的水平距離為?
4.Consider the RC circuit that has been
disconnected for a very long time before switching
on at the time t = 0.
(a) Find the voltage across the capacitor right after
switching on the switch S.
(b) Find the initial current I(0) that flows through the
resistor 4歐姆t = 0
(c) Find the current I(t) that flows through the
resistor 4歐姆 t > 0
(d) Find the current I1(t) that flows through the
resistor 8歐姆 t > 0
圖在下
_____電阻(4歐姆)____/ S______________
| | |
| | |
| 電阻(8歐姆) 電容(0.5F)
電池(5V) | |
| | |
|___________________________|_________|
5.Consider a system of 1 mole of
oxygen gas at temperature 1000 oC. The oxygen
gas undergoes free expansion and triples its volume.
Find the entropy change in the free expansion.
以上 謝謝各位!
感激不盡
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