Steve

Anyone mind helping me out with one of these? Im not looking for an answer sheet, but If you could walk me through one example I could figure out the rest.. I dont really know what is being asked of me..

"Regarding each pitch as a root, construct the triad is it would normally appead in the indicated keys. For minor keys, use the most common minor-key harmonies, as explained in the chapter. then identify the triad's function in each key by placing Roman numerals in the blanks."

Or if you remember it. My girlfriend is streaming it live for nostalgia's sake. Should check her out if you're bored.

www.twitch.tv/pretty_scary

My professor said I was basically right however didn't really give many pointers to my error. saying that I need to watch my powers of 10.

If you want to make a low pass filter which significantly attenuates signals above 6kHz using a 60 ohm resistor and a capacitor, what value capacitor, in microfarads (ΩF), should you use?

1/(2*3.14*6000*6) is what I've been doing, which is 4.4231 or so. so I thought it would then be about 423.1 Microfarads or so.. however this is wrong.. any tips would be appreciated..

A microphone with an impedance of 2k Ω is connected to a cable of length 500 ft. The cable is specified as having a capacitance of 49 pF/ft and a resistance of 21 ohms/1000ft. Ignoring what is connected at the other end of the cable, at what frequency (kHz) would you expect the signals to be attenuated by about 6 dB?

If I want to make a low pass filter which significantly attenuates signals above 5kHz using a 60 ohm resistor and a capacitor, what value capacitor, in microfarads (ΩF), should I use?

A microphone is specified as having a sensitivity of -50dBV/Pa. What voltage, in mV, do you expect to get from that microphone when the sound amplitude is 2Pa?

I was shown something like:

–50 dBV = 0.00316 mV

0.00316 mV / Pa x 2 Pa = 0.00632 mV or 6.32 mV

as being the correct answer however I don't see how the .00316 came about from the -50 dBV..

would anyone mind explaining that to me?

I'm struggling with this question.. Anyone mind giving me a hand..?

A microphone is specified as having a sensitivity of -60dBV/Pa. What voltage, in mV, do you expect to get from that microphone when the sound amplitude is 3Pa?

A microphone is specified as having a sensitivity of -50dBV/Pa. What voltage, in mV, do you expect to get from that microphone when the sound amplitude is 2Pa?

A microphone with an impedance of 18 kΩ is connected to a cable of length 370 ft. The cable is specified as having a capacitance of 59 pF/ft and a resistance of 31 ohms/1000ft. Ignoring what is connected at the other end of the cable, at what frequency (in kHz) would you expect the signals to be attenuated by about 6 dB?

If you want to make a low pass filter which significantly attenuates signals above 2kHz using a 60 ohm resistor and a capacitor, what value capacitor, in microfarads ( ΩF), should you use?

Starting with a resistance 4k Ω If I want to get a time constant of 70ms. What capacitance should I use? Preferably in Microfarads?

A parallel plate capacitor which has Teflon between the plates is rated to be used to a maximum of 130kV. Approximately what is the spacing between the plates (in inches)?

I think I have teflon's dielectric strength as 1500 KV/Inch

I also have Teflon's Dielectric Constant as 2.1

A 70 μF capacitor is charged using a 3V battery through a 3000 Ω resistor. What is the time constant (in seconds) for this process?

An 80 μF capacitor is charged using a 2V battery through a 4200 Ω resistor. What is the time constant (in seconds) for this process?

A parallel plate capacitor which has Teflon between the plates is rated to be used to a maximum of 120kV. Approximately what is the spacing between the plates

Teflon has a 2.1 Dielectric constant

A 80 μF capacitor is charged using a 2V battery through a 4200 Ω resistor. What is the time constant (in seconds) for this process?

A capacitor is measured to have a voltage of 2.0V. If you increase the voltage to 13.0V, by what factor have you changed the energy stored in the capacitor?

A parallel plate capacitor is constructed using plates of area A and a spacing between the plates d with air in the region between. That capacitor has a capacitance of 37pF. A graduate student attempts to make a copy but mistakenly uses inches rather than centimeters for all the dimensions, so all dimensions are 2.54 times larger than the original. What is the capacitance of the graduate student's capacitor (in pF)?

An 80 μF capacitor is charged using a 2V battery through a 4200 Ω resistor. What is the time constant (in seconds) for this process?

A room of ceiling height h, with a rectangular floor of dimensions w and l is measured to have a reverberation time of 1.10s. In this room the walls have effectively no absorption at all and the ceiling and floor have an absorption coefficient of 0.9. If h and w are both doubled, what is the new reverberation time (in s)?