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homeworkhelpls
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Why is resistivity inversely proportional to resistance for NTC semiconductors?
I Why is resistivity inversely proportional to resistance for NTC semiconductors?
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Resistivity is inversely proportional to resistance in NTC (Negative Temperature Coefficient) semiconductors due to their temperature-dependent conduction properties. As temperature increases, the charge carriers in NTC materials become more mobile, leading to lower resistivity and, consequently, lower resistance. This relationship is critical for applications in temperature sensing and circuit protection. The discussion highlights the importance of understanding these properties in the context of thermistors and their conduction models. Overall, the inverse relationship plays a significant role in the functionality of NTC semiconductors.
Power = Force v Speed
Power of my horse = 104kgx9.81m/s^2 x 0.732m/s = 1HP =746W
Force/tension in rope stay the same if horse run at 0.73m/s or at 15m/s, so why then horse need to be more powerfull to pull at higher speed even if backward force at him(rope tension) stay the same?
I understand that if I increase weight, it is hrader for horse to pull at higher speed because now is backward force increased, but don't understand why is harder to pull at higher speed if weight(backward force)...