resonance

I have attempted this revision question although I am not convinced that my answers are correct. I believe the Res Freq is 9.19KHz is this correct? Can you please show me how to complete this question and the formula required to do so.

plot

Find and plot Vo(t), if io=10e^-200t Assume v(o- bar on top of o)= +400 volts see attachment for picture

lightbulb resistance and efficiency

A GE Softwhite lightbulb is rated as follows: rated power = 60 W ; rated optical power = 820 lumens (lm) 1 lm = 1/680 W operating life = 1.5 h rated operating voltage = 115 V The resistance of the filament of the bulb, measured with a standard multimeter is 16.7 ohms. When the bulb is connected into a circuit and is operating at the rated values given above, determine the resistance of the filament and efficiency of the bulb. ***answer should be 220.4 ohms and 2.009%*** I didn't get the same answer...

Logic Circuit Truth Table

1. Determine the truth table for the following logic circuits. 2. Design a combinational logic circuit to control segment "a" of the 7-segment calculator display. (See attachment for full question)

RC Series Circuit

I am attaching a scanned image of a question, please answer and include the method used for solving. See attached file for full problem description.