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Quality answers to common physics questions
May25-09 10:31 AM ZapperZ 
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 68,093
The aim of this thread is to highlight recent (as in within the past 3 months) noteworthy physics papers that have...
May6-14 04:32 AM
Cthugha
168 179,036
A chemist measured the pressure of a gas in atmospheres at different temperatures in C: Temp (C) -136 -25 0 25 100...
Oct26-11 04:39 PM
Doc Al
10 2,479
According to Bernoulli eq Pressure of a fluid in a vertical pipe is lower where area is small.But from General formula...
Jun25-12 11:36 PM
moatasim23
8 936
I am trying to find an equation to find the pressure of a fluid as it leaves a hypodermic needle when all I have is...
Oct2-11 08:14 PM
nerdguy
3 1,645
Is it easy to compress helium,not into a tank,just enough to make it heavier than air?and how much weight can it lift...
Nov30-09 09:40 PM
Q_Goest
1 1,462
The problem is the following: we have 2 half's of a cylinder and they are put together using 6 screws, forming a full...
Aug25-12 04:22 PM
haruspex
3 766
Hello there,Could you explain to me how to calculate the pressure on the lateral sides of a tank?...
Oct15-11 06:32 PM
Misr
31 8,199
Consider a sphere of mass M and radius R. The interior of the sphere is a uniformly distributed mass M. The surface...
Aug1-11 12:09 AM
granpa
1 757
how would you find the pressure on an object as it rises up into the atmosphere ex. A child's helium-filled...
Jan23-09 08:27 PM
mgb_phys
1 833
Hi there I am using a pair of pro-jump jumping stilts (spring loaded) We are looking for an indoor hall for when...
Apr22-11 07:14 PM
Pro-Jumper
3 952
Hi Guys, I have a sheave with 7 rollers spread evenly on 180 radius. There is an equal amount of force on each end...
Apr7-14 05:34 AM
jbriggs444
1 313
Hi all, A problem pops up while I was trying to calculate the pressure impacts on my aquarium tank walls. The...
Jan28-13 10:38 PM
banhbo_tt
5 649
I have a somewhat unique question here. I know that Pd is a very good absorper of hydrogen. My question is,...
Nov19-03 09:47 PM
Brad_Ad23
0 975
Hello,world http://img257.imageshack.us/img257/5245/unled2vw.jpg I don't understand where those equations have...
Oct17-11 02:59 AM
Low-Q
16 1,559
A step change in air pressure from 14.7 psia to 16.7 psia is applied to one end of a 7 inch long tube (approx. 0.06...
Oct6-09 10:46 AM
Ron D
0 847
If pressure = force x area 1) why do we measure it in mm of Hg (distance) 2) why do I observe pressure to decrease...
Sep7-07 08:56 AM
Danger
9 1,921
I am sitting in the library just thinking and I have a general question about pressure. Basically think of the problem...
May2-14 05:44 PM
paisiello2
10 437
I really need help on this question because it is driving me insane. A car weighs 8000 N. It has four wheels. Each...
Nov6-03 07:02 AM
QuantumNet
2 1,356
Ok I am wondering how to solve this or go about figuring it out. This is what I am trying to do. I have a 253.859...
Feb28-12 02:18 PM
cjl
7 1,992
Hi, I would like to know how would i be able to solve a problem involving two (2) pressure reducing orifice plates...
Nov22-13 04:42 AM
Baluncore
4 540
Hello, I am new here and have a question about sizing a chamber for pressure reduction. I am going to run CO2 75...
Nov14-13 09:28 AM
andyhull77
2 566
If, I have a 2.5" dia X 60 inches tube, at a internal pressure of 15,000 psi. If the valve is opened (orifice opening...
Mar7-13 09:10 PM
JustinRyan
5 759
Which pressure or force is higher to rupture a tube,to rupture it from inside or outside ?I think from outside will be...
Aug15-11 08:51 AM
tasp77
1 904
Assume all dims in millimeters and kilos and I am working on a hydraulic set up I have a cylinder 200mm diameter x...
Oct26-11 12:45 PM
benb4ll
4 2,209
I am not smart enough to know the answer to this question. My son is being accused of touching a bike yes touching on...
Oct2-11 08:24 AM
Naty1
10 2,207
I could not decide where to post this, it concerns astronomy to a degree but my question mostly involves pressure...
Nov4-11 04:50 PM
Physics quest
6 1,467
Hi, I'm a little confused about the pressure in the inlet/outlet and the throat of a Venturi tube. Why is the...
Jul22-12 11:40 AM
extricate
2 928
A high-frequency response pressure transducer at one end of a 7 inch long (approx. 0.6 inch ID) tube will be used to...
Oct6-09 12:39 PM
Ron D
2 1,829
Hello everyone, I have a concern regarding the conservation of momentum for an incompressible Newtonian fluid with...
Oct4-13 02:03 PM
Chestermiller
7 833
I have a question for you all, say you have a pressurized cylinder with water in it, it is at 200*F and at a pressure...
Jun24-04 07:41 AM
Artman
3 3,831
I would like to make a pressure vessel with a pressure of about 9 bars/130.5 psi, that contains about 250 grams of...
Jul28-11 12:39 PM
berkeman
13 3,069
Hi all, I have a problem I hope someone could help. I have a pressurized dry Nitrogen vessel. Given a known leakage...
Aug1-08 01:15 PM
Dwarf
2 4,198
I have to design a chamber where a range of small pressure vessels can be safely pressure tested. They range up to...
Feb5-09 12:07 PM
Beaujolais
1 1,706
If we know the flowrate of a pump, is it possible to find out the pressure of the pump?
Dec7-09 12:08 PM
stewartcs
3 4,305
First off, let me say that I have spent hours trying to figure out how to calculate what I want here, but to no avail....
Nov24-09 10:28 PM
Tux
0 1,146
Think of a pipe positioned horizontally. Some fluid is flowing from left to right.(e.g. water) Right side of...
Sep2-05 05:37 AM
quark
5 1,580
Please forgive what I'm sure is a dumb question, but I'm stumped. Is there a way to determine the amount of...
Sep27-04 03:25 PM
krab
5 6,099
This isn't a homework question; however, it is probably similar to one. I am doing a design project that involves a...
Apr27-06 04:18 AM
Kurdt
4 14,023
I'm trying to create a piece of software that can approximate the physics of a valveless pulse jet engine. What I need...
Mar3-11 11:22 PM
telepresence
3 1,864
Physics books and websites are full of Ideal Gas info and solutions when it comes to relating pressure, volume, and...
Jun26-09 09:17 AM
Mapes
3 28,940
Given a wave that begins at a point source that travels outward spherically, i know that for a 1D wave (from the...
Nov24-08 04:08 PM
clem
1 995

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