# density

### How do I find the terminal speed of a body in water?

1. The problem statement, all variables and given/known data A baseball has a terminal speed of 42 m/s in air (ρ = 1.2 kg/m^3). What would be its...
Thread by: Ushitha Dissanayake, Jun 11, 2018, 13 replies, in forum: Introductory Physics Homework

### I How to control the weight of an object?

Hello everyone, First off, i would like to apologize for any spelling errors. I am Portuguese and my english is going to be very simple. I am in...
Thread by: Nuno Miguel, Apr 19, 2018, 23 replies, in forum: General Physics

### Calculating a push force using area, speed, and density?

1. The problem statement, all variables and given/known data The doorway in the previous question measures 1.06 m x 2.04 m, and the wind blows...
Thread by: struggtofunc, Apr 9, 2018, 8 replies, in forum: Introductory Physics Homework

### I Mechanical waves encountering a change in Density

Suppose a ocean wave encountered a section of ocean which had a higher level of aeration from gas such as methane escaping from the seafloor. Due...
Thread by: Tom79Tom, Mar 15, 2018, 16 replies, in forum: General Physics

### I Effect of momentum distribution on probability density

Hi all, I have the following query: I understand that the "make-up" of momentum probability density $|\tilde{\Psi}|^2$ has an effect on the...
Thread by: WWCY, Feb 1, 2018, 4 replies, in forum: Quantum Physics

### I Is there an absolute density?

This is kind of a random question. Is there a point that a substance density will max out? Or in other words that it cannot be compressed any...
Thread by: Cody Wall, Dec 13, 2017, 3 replies, in forum: General Physics

### Chemical Polymer Separation (PLA, ABS, HIPS, and PETG)

Good day all! I've got a granular mixture of PLA, ABS, HIPS, and PETG with a particle size of about a quarter inch, and I'm trying to isolate...
Thread by: not_a_chemist, Nov 28, 2017, 3 replies, in forum: Chemistry

### I Understanding Gauss' law: diff b/w E and D flux?

I noticed the other day something odd in how we use Electric and Magnetic flux. The definitions I refer to are magnetic flux density (B), magnetic...
Thread by: tim9000, Oct 25, 2017, 1 replies, in forum: General Physics

### Finding population density with double integrals

1. The problem statement, all variables and given/known data A city surrounds a bay as shown in Figure 1. The population density of the city (in...
Thread by: Mohamed Abdul, Oct 21, 2017, 11 replies, in forum: Calculus and Beyond Homework

### I Electric field integral: Convergence where ρ is nonzero

Hi. I know how to use Gauss' Law to find the electric field in- and outside a homogeneously charged sphere. But say I wanted to compute this...
Thread by: greypilgrim, Oct 3, 2017, 6 replies, in forum: Classical Physics

### Pressure at the center of an accelerating sphere

1. The problem statement, all variables and given/known data Consider a glass sphere completely filled with water except for a small air bubble at...
Thread by: Nathan B, Sep 8, 2017, 3 replies, in forum: Introductory Physics Homework

### B What property of a fluid determinates rising and sinking Velocities

If we have a bottle with a fluid A of X density, and in the bottom of this bottle it magically spawns the same amount of fluid B with X/2 density,...
Thread by: Gabriel Ulisses, Jul 22, 2017, 2 replies, in forum: General Physics

### Solids with different sound velocity at diffrent tempratures

i work on phononic crystals and i want to find solids with diffrent sound velocities and mass density in diffrent temprature i can just find BST...
Thread by: Mehran, Jul 9, 2017, 1 replies, in forum: Atomic and Condensed Matter

### Is diborane lighter or heavier than air?

Hi, I have been reading about diborane (B2H6, a gas at standard conditions) and while the sources provide different density values (!), as in...
Thread by: xpell, Jun 23, 2017, 17 replies, in forum: Chemistry

### B How can Greenland lose 269b tons/year and loose only 269km3?

The density of ice is 920 kg/m3. Now let's calculate. m = 269 000 000 000 000 kg p = 920 kg/m3 ----------------------------- v=? V=m/p V=269 000...
Thread by: IvicaPhysics, Jun 12, 2017, 4 replies, in forum: Classical Physics