Question

F=20kH. СИ S=30m. A-? МДж

Answer 1

A = F*S.
20 кН = 20000 Н.
А = 20000*30 = 600000 Дж = 0,6 МДж. 

Answer 2

I'm sorry, but the question doesn't provide enough information to solve for A in MJ (megajoules).

The given information is:

• Frequency (F) = 20 kHz
• Capacitance (C) = Not given
• AC Voltage (V) = Not given
• AC Current (I) = Not given
• Time (t) = Not given
• SI (square inches) = 30 m

Without additional information, it is not possible to calculate the energy (A) in MJ. Could you please provide more context or information about the problem?