Search found 28 matches
- June 3rd, 2019, 7:19 pm
- Forum: 2019 Nationals
- Topic: Nationals Event Discussion
- Replies: 124
- Views: 43065
Re: Nationals Event Discussion
Potions (10): I was super happy with my placement though the test overall was kinda weird. It hit most of the bases, but I was surprised that there weren’t any serial dilutions or pollution maps. There was no dedicated section to metals which was weird as well. It was a little disappointing to see ...
- June 3rd, 2019, 7:12 pm
- Forum: 2019 Nationals
- Topic: Nationals Event Discussion
- Replies: 124
- Views: 43065
Re: Nationals Event Discussion
Disease Detectives (10): Overall a disappointingly easy test. I felt like it didn't allow people to demonstrate their capabilities, but I absolutely adore the test writer, Ralph Cordell. The score distribution for DD reflects the quality of the test (not great), and the lack of free response was ver...
- March 14th, 2019, 6:54 pm
- Forum: 2019 Question Marathons
- Topic: Circuit Lab B/C
- Replies: 154
- Views: 41001
Re: Circuit Lab B/C
What are the values of R3 and R4 if you want the battery to supply 83.3 mA to the circuit while the ammeter reads 0.00mA? Image: https://drive.google.com/open?id=1_cVQzrlTEcn5QR0MSS49hMGLcoC9kaRg Answer|The 0 current condition requires that [math]\frac{R_3}{R_4}=\frac{20}{280}[/math], and the 83.3m...
- March 14th, 2019, 6:17 pm
- Forum: 2019 Question Marathons
- Topic: Circuit Lab B/C
- Replies: 154
- Views: 41001
Re: Circuit Lab B/C
What are the values of R3 and R4 if you want the battery to supply 83.3 mA to the circuit while the ammeter reads 0.00mA?
Image:https://drive.google.com/open?id=1_cVQz ... GLcoC9kaRg
Image:https://drive.google.com/open?id=1_cVQz ... GLcoC9kaRg
- March 13th, 2019, 3:37 pm
- Forum: 2019 Question Marathons
- Topic: Circuit Lab B/C
- Replies: 154
- Views: 41001
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 1st, 2019, 8:29 pm
- Forum: 2019 Question Marathons
- Topic: Circuit Lab B/C
- Replies: 154
- Views: 41001
Re: Circuit Lab B/C
That's right!Things2do wrote:To measure unknown resistors under 1 Ohm?
the resistance of the wires becomes significant
- March 1st, 2019, 3:12 pm
- Forum: 2019 Question Marathons
- Topic: Circuit Lab B/C
- Replies: 154
- Views: 41001
Re: Circuit Lab B/C
When and why would you use a Kelvin Double Bridge?
- February 27th, 2019, 4:26 pm
- Forum: 2019 Question Marathons
- Topic: Disease Detectives B/C
- Replies: 128
- Views: 36928
Re: Disease Detectives B/C
On behalf of wec01, I confirm this answer.UTF-8 U+6211 U+662F wrote:Cathy-TJ wrote:"Note: I do not have enough knowledge to write a question" - wec01wec01 wrote:I was told (by Cathy-TJ) to ask:
What was the “four inch rule” created to protect against?Salmonellosis from pet turtles
- February 27th, 2019, 12:07 pm
- Forum: 2019 Question Marathons
- Topic: Circuit Lab B/C
- Replies: 154
- Views: 41001
Re: Circuit Lab B/C
Positive and negative charge carriers behave the same in almost all circuits. However, there are some circuits in which it actually makes a difference whether charge carriers are positive or negative. What is an example of a circuit in which this matters, and why does the distinction matter for thi...
- February 26th, 2019, 8:04 pm
- Forum: 2019 Question Marathons
- Topic: Circuit Lab B/C
- Replies: 154
- Views: 41001
Re: Circuit Lab B/C
Positive and negative charge carriers behave the same in almost all circuits. However, there are some circuits in which it actually makes a difference whether charge carriers are positive or negative. What is an example of a circuit in which this matters, and why does the distinction matter for thi...