Cáp tròn truyền dưới nước bao gồm một lõi đồng và...
Câu hỏi: Cáp tròn truyền dưới nước bao gồm một lõi đồng và bao quanh lõi đồng là một lõi cách nhiệt như hình vẽ . Nếu \(x = \frac{r}{h}\) là tỉ lệ bán kính lõi và độ dày của vật liệu cách nhiệt thì bằng đo đạc thực nghiệm người ta thấy rằng vận tốc truyền tải tín hiệu được cho bởi phương trình \(v = {x^2}\ln \frac{1}{x}\) với \(0 < x < 1\). Nếu bán kính lõi là 2cm thì vật liệu cách nhiệt có bề dày h(c,m) bằng bao nhiêu để tốc độ truyền tải tín hiệu lớn nhất?![](data:image/png;base64,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)
A. \(h = 2e(cm)\)
B. \(h = \frac{2}{e}(cm)\)
C. \(h = 2\sqrt e (cm)\)
D. \(h = \frac{2}{{\sqrt e }}(cm)\)
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi học kì 1 môn Toán lớp 12 Trường THPT Kim Liên năm học 2017 - 2018