一道英文的物理题Which of the following is a torque expression?A. ???? = maB. ???? = m????vC. ???? = vsinA????D. ???? = FsinA*d翻译一下,还有答案是哪个?

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• 英语翻译a 6-cm-diameter metal cylindrical scatterer in free space is modeled.The source excitation is a Gaussian pulse with a carrier frequency of 5 GHz.The grid resolution (dx = 3 mm) was chosen to provide 20 samples per wavelength at the center frequency of the pulse (which in turn provides approximately 10 samples per wavelength at the high end of the excitation spectrum,around 10 GHz).The computational domain is truncated using the perfectly matched l