## Search found 121 matches

March 13th, 2019, 4:58 pm
Forum: 2019 Question Marathons
Topic: Circuit Lab B/C
Replies: 154
Views: 15168

### Re: Circuit Lab B/C

Since no one has posted a question yet: An LED with voltage drop 3.2V and internal resistance 2\Omega is in series with a voltage V and resistance R . The LED’s maximum rated current is 10mA , and the minimum current at which its light is visible is 100\mu A . 1. What is the minimum series voltage ...
March 13th, 2019, 8:17 am
Forum: 2019 Question Marathons
Topic: Circuit Lab B/C
Replies: 154
Views: 15168

### Re: Circuit Lab B/C

Since no one has posted a question yet: An LED with voltage drop 3.2V and internal resistance 2\Omega is in series with a voltage V and resistance R . The LED’s maximum rated current is 10mA , and the minimum current at which its light is visible is 100\mu A . 1. What is the minimum series voltage V...
March 13th, 2019, 5:35 am
Forum: Mission Possible C
Topic: Mission Possible C
Replies: 170
Views: 34970

### Re: Mission Possible C

How many points does one usually have to earn to win a medal at regionals and also at states? Like if you tallied up the raw score from all the storable actions and timers and points for other things, what’s the minimum amount of those points needed to get a medal at regionals and what’s the minimu...
March 12th, 2019, 7:33 pm
Forum: 2019 Question Marathons
Topic: Thermodynamics B/C
Replies: 127
Views: 13161

### Re: Thermodynamics B/C

A hot and cold reservoir are used to convert heat to work in a Carnot cycle. The hot reservoir starts at 400K and has a heat capacity of 40 J/K, and the cold reservoir starts at 100K and has a heat capacity of 20 J/K. The Carnot cycle runs until the reservoirs are in thermal equilibrium. 1. At what ...
March 8th, 2019, 7:16 pm
Forum: 2019 Question Marathons
Topic: Thermodynamics B/C
Replies: 127
Views: 13161

### Re: Thermodynamics B/C

https://images.prod.meredith.com/product/b9b87c19f0d193931ecef9b04415e05c/1525247417626/l/stretched-canvas-art-galileo-thermometer-ngalileo-galileis-open-thermometer-or-thermoscope-wood-engraving-19th-century-medium-18-x-24-inch-wall-art-decor-size 1) What is this device known as? 2) Who is general...
March 4th, 2019, 6:13 pm
Forum: 2019 Question Marathons
Topic: Sounds Of Music C
Replies: 120
Views: 15003

### Re: Sounds Of Music C

1. What is a pedal tone? 2. On which instruments can a pedal tone be played? 3. Is a pedal tone in the instrument’s harmonic series? Is it a resonant frequency for the instrument? What tradeoffs do instrument designers make relating to pedal tones? 4. Would a player be more likely to play pedals wh...
March 3rd, 2019, 8:35 pm
Forum: 2019 Question Marathons
Topic: Sounds Of Music C
Replies: 120
Views: 15003

### Re: Sounds Of Music C

1. What is a pedal tone? 2. On which instruments can a pedal tone be played? 3. Is a pedal tone in the instrument’s harmonic series? Is it a resonant frequency for the instrument? What tradeoffs do instrument designers make relating to pedal tones? 4. Would a player be more likely to play pedals whe...
March 2nd, 2019, 8:39 pm
Forum: 2019 Question Marathons
Topic: Sounds Of Music C
Replies: 120
Views: 15003

### Re: Sounds Of Music C

Yeah, I accidentally mixed the two words up Here are some general violin questions: 1) What is the interval between adjacent strings of the violin? 2) What is the technique of plucking a violin (or other stringed instruments in general) called? 3) How does a bowed instrument produce noise and how d...
March 2nd, 2019, 8:31 am
Forum: 2019 Question Marathons
Topic: Sounds Of Music C
Replies: 120
Views: 15003

### Re: Sounds Of Music C

Wouldn't we need the spectrogram to do this? Or are we assuming all frequencies are at the same volume? Most instruments are loudest at their fundamental, or 80 Hz (slightly flat E2). I'm not sure about the second one. Nope.|It’s relevant that these are chimes. Chimes’ perceived notes are determine...
March 2nd, 2019, 6:16 am
Forum: 2019 Question Marathons
Topic: Sounds Of Music C
Replies: 120
Views: 15003

### Re: Sounds Of Music C

A percussionist strikes a chime bar and measures some of its resonant frequencies: Fundamental: 80 Hz 1st overtone: 220 Hz 2nd: 430 Hz 3rd: 715 Hz 4th: 1070 Hz 5th: 1500 Hz What note would the ear most likely hear based on this series of overtones? What overtones contribute the most to the percepti...