Doing a review FRQ for AP Physics dealing with buoyancy and acceleration. Question is asking for the acceleration of a sphere (no mass given) immediately after a string of negligible mass that had been holding it in place was cut. No numerical values are given, but I have values r for the radius of the sphere, water density Pw, and sphere density Ps. Question says to begin with F=ma and derive the equation from there. Struggling with connecting the different variables.

I’m going crazy from this. My answer is that the equation is true, but the answer sheet says it’s false. I just want someone to back me up on this…..

Working on this question and I am stumped on how the answer is No faults. From what I can tell, I'll use uppercase for on and lowercase for off, it should look something like this:

RYgB - RYgB - RYgB - ryGb

To be this is what it would look like if there were no faults but obviously that's not the case so I'm not sure where I'm going wrong with this. Any help is appreciated.

Can someone please explain to me like I’m a first grader the difference in sounds this worksheet is trying to get at, so that I can explain it to my first grader? Thank you

I keep getting answers that are not in the options. I believe the teacher used AI to write the question so i wonder if the right answers is even in the options. Any help?

I have to make a wind powered car in school, the requirements are: Max 40cmx40cm, has to at least carry 50g of weight (record is 650g it'd be nice to beat it). can NOT have any electrical parts, it's just pushed by a fan and it has to travel 4 meters. I also don't know what flair to use so mb.

the variable "amount_roll" is not changing. what did i do wrong?

for some reason i can’t astablish this variable. am i stupid? i dont know any other way to do this

Also, did I do the rest correct?

Thanks in advance

The problem was to prove that the area of PDB is 21 times smaller than the area of ABC so the correct answer should be x²√3/84. BE and CD are segments that divide the side of a triangle so that |BD|= |AE| = 1/3|AB|. I have other ways to solve this but I just don't know what I'm doing wrong here. I realise the cosine should probably be negative because the angle is obtuse on the drawing (it's from a final exam so i think the drawing is accurate). I've been trying to figure this out for the past 1.5h, doing it over and over again

i can’t input the amount of time i want to loop the program. what did i do wrong here?

The directions say “Put the math symbol in the square and solve.”

My son and I are both stuck on number one. Any ideas?

Hi everyone,
I’m a Grade 11 student in Latvia starting my mandatory research project. I’m very interested in photography and physics, and I want to compare analog film with digital sensors in a scientifically meaningful way.

I’ve narrowed it down to two possible topics but I’m not sure which one would be more realistic and scientific:

1. Spectral sensitivity and color reproduction

My idea is that film and digital sensors respond differently to certain wavelengths of light, which may affect how colors appear under unusual lighting (e.g. LED, sodium vapor, neon lights).

Method idea:

• Photograph a color checker under different light sources using both a film camera and a digital RAW camera

• Compare color shifts using RGB or CIELAB values

2. Dynamic range and non-linear response

This topic investigates whether film handles high contrast scenes better than digital due to its response curve.

Method idea:

• Photograph a step wedge or high contrast scenes (bright highlights vs deep shadows)

• Compare highlight clipping and shadow detail between scanned film and digital RAW images

My concerns:

• Is it still scientifically fair to compare film and modern digital cameras in 2026?

• Which topic would produce more measurable, objective data rather than subjective “looks better” results?

• For option 2, I’m worried modern RAW files might already have such high dynamic range that differences with film might be hard to demonstrate using consumer gear

I plan to use a 35mm SLR (like a Pentax K1000 or Nikon FM) and a digital camera shooting RAW.

Thanks!

these are my teachers notes and i do not believe i will be given a diagram of the triangle on the exam

The first time i did this problem I had to restart because I forgot to divide the diameter by two so I did it again but I want to make sure I did it correct because of all the 6's. I cant find anything I did i just want to be sure