# Science Help

## Biodegradable plastic

Is cellulose acetate - in thin film form - biodegradable ? If yes,how do I check it's biodegradability ?

## Fluid pressure on an object in open system

Hello everyone, I have a physics question on pressure exerted by a fluid onto an object (see attachment). I would like to know how I can calculate the total pressure exerted on an object in a vessel by flowing fluid (water) with an open outflow. It has been too long since I took college physics, a... Fluid pressure on an object in open system

## Soak back temperature

Could someone explain what an object's soak back temperature would be? My idea of what it is relates to an object's temperature peaking before cooling down due to the absorption of leftover energy (i.e. a car engine is being cooled by a fan. The fan and engine both shut off, and the engine... Soak back temperature

## Evaluating [C, D] commutator...

1. The problem statement, all variables and given/known data I am practicing problems from the textbook, but have no idea how to get to some of the solutions available in the back of the textbook.... 6-16. Evaluate the commutator [C,D] where C and D are given below: (e) C =... Evaluating [C, D] commutator...

## Midpoint rule causing confusion

1. The problem statement, all variables and given/known data A Cat scan produces equally spaced cross-sectional views of a human organ that provide information about the organ otherwise obtained only by surgery. Suppose that a CAT scan of a human liver shows cross... Midpoint rule causing confusion

## Numerical solution of a differential equation with time dependent terms

I am would like to solve this differential equation: View attachment 74259 Where View attachment 74260 View attachment 74261 ... Numerical solution of a differential equation with time dependent terms

## Mains electric noise

What is the frequency of mains electric noise in the uk?

## Allele frequencies of the next generation

1. The problem statement, all variables and given/known data Starting with 75 light-colored beans and 25 dark-colored beans, the 100 beans represent my gene pool. Light beans = F and dark beans = f. p = (total F alleles) / (total number of beans used) And now I'm stuck where it's asking me... Allele frequencies of the next generation

## Einstein or non science?

There was a recent post about "parroting Einstein". There are these people I know who have got themselves a new idea about rectangles. They think that you can take a 2 by 1 rectangle and make it half the size, not by putting it into the distance but by angling it! This seems like utter... Einstein or non science?

## Functions and Rearranging Help

Two functions are defined as: f(x) = 1/(-10x+14)+17 g(x) = 1/(-4x-3) Find fg(x) and gf(x) and simplify answer into form (ax+b)/(cx+d) where a,b,c and d are numbers to be found. I know it is common practice to put in some of my own attempts onto here, but I am not even getting remotely close to an... Functions and Rearranging Help

## Neutrino-to-neutrinos interaction possible?

Could an energetic neutrino (of any flavor), on passing near an electron, nucleon, or nucleus, be stimulated to emit a neutrino pair (of any flavor)? An example might be an energetic electron-neutrino, passing close to a nucleus, and emitting a muon-neutrino/muon-antineutrino pair., with the... Neutrino-to-neutrinos interaction possible?

## How to generate powerful electric fields in a small space

How would you generate extreme electric fields between two small surface area parallel plates.

## How to find angle after applying Pythagorean Theorem?

Hello, so I have a question that states (these aren't the actual measurements but they are around about the same, I can't remember the exact numbers so I made these up, this way I could apply the same to the actual numbers) an object being 4km above me, 1.4km to the north of me, and 2km to the... How to find angle after applying Pythagorean Theorem?

## Selection bias with respect to potentially apocalyptic events

Note to moderators: I’m not sure if this topic is mainstream enough for the forum. If you decide to remove it, I’ll understand. Not convinced I've put it in the right section either! I’m sure you’re all familiar with, or will easily understand, survivor bias, which is a form of selection... Selection bias with respect to potentially apocalyptic events

## Balloon drop project

It's a balloon drop. So the purpose is to have a balloon drop on a bed of nails and not have it burst until it is dropped from exactly ten feet. Drops will begin at 2 ft and progress from 2,4,6,8,8.5,9,9.5, and 10ft. Any balloon that doesn't burst at or below 10ft gets a 0. I can't modify the bed... Balloon drop project

## Ohio State vs. WUSTL vs. Notre Dame for particle cosmology theory?

First off, my supervisor has connections at both, albeit under different forms: my supervisor postdocked at Ohio State, while he personally knows a professor at WUSTL and another research collaborator I worked with and that writes me a LOR knows another professor at WUSTL (connections at WUSTL:... Ohio State vs. WUSTL vs. Notre Dame for particle cosmology theory?

## Integration: force on submerged triangular plate

1. The problem statement, all variables and given/known data Submerged (vertically) right triangle 12x9x15(hypotenuse) with 12 m leg parallel to water surface. Top of triangle is 3m below surface. Find force on triangle. 2. Relevant equations I know mass of water is 840... Integration: force on submerged triangular plate

## Synthetic Potential

Energy is multiform! When energy gets cold it hardens and when energy gets hot it becomes more nonresistant. The temperature of energy determines the form. Half hot and half cold energy resonates giving it more synthetic potential!

## Space pirates

A common trope in pop SF. But can they be realistic in a hard SF, no FTL, no hide in space? I have collected a few counterarguments (C, and my justifications (A to overcome them, but i'd like to see other opinions as well, whether my answers has great flaws or not, maybe advices, good books... Space pirates

## Chasing Ice, the Documentry

I was fortunate to spend a few weeks recently with the director of Chasing Ice, Jeff Orlowski. I'm going to plug Chasing Ice because it's an amazing film. Jeff along with EIS (http://extremeicesurvey.org/)... Chasing Ice, the Documentry