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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
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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
168 189,907
Yesterday night, when I was on my bed, one of the funny question came to my mind and I'm posting it here before I...
Apr19-10 05:08 PM
11 7,117
If the velocity of air flow through a grill is halved but the area of the grill is doubled, By what factor will the...
Aug1-13 05:34 AM
1 496
is there a relation between the density of a sphere spinning at a given rate and the degree by which the minor axis...
Sep3-08 06:41 AM
5 1,537
what is the relationship between these two things for a given material?
Sep7-08 04:43 PM
15 6,207
is there a relationship between the speed of sound and the density or the young modulus of the substance? if so what...
Dec7-08 11:44 PM
1 10,275
for example, if a mall is thrown, it forms a parabola, but its speed also decreases due to the friction in air. what...
Mar4-09 06:41 AM
3 1,443
A massless, frictionless pulley is suspended from a rigid rod. Two masses, m (50 kg) and M (60 kg), are suspended on...
Dec31-03 12:35 PM
Soaring Crane
2 1,854
1. A 10 kg brick falls from a height of 2 m. a. Suppose it falls unto a carpet, 1 cm thick. Assuming the force...
Feb7-04 08:04 AM
3 1,443
What does light refraction have to do with the sky being blue (or any color for that matter)? Thanks for any...
Mar20-04 03:34 PM
3 1,414
I was glancing at a physics book, and two questions in the electricity section caught my eye. Why does a cow that...
May5-04 05:17 PM
Blistering Peanut
1 1,460
Consider a long conducting rod that is suspended by insulating strings. Assume that the rod is initially electrically...
Feb16-05 06:20 PM
4 5,474
I don't quite understand the behavior of a couple of objects when they are placed in close contact with a VDG...
Jan4-08 11:14 AM
1 2,213
Why do electric charges of opposite sign attract each other but charges of the same sign repel each other?
Jan22-07 10:45 PM
7 1,446
If there are two bodies, such as a sphere and a thin rod (each with exactly the same charge), why does the sphere have...
Jan24-07 07:18 AM
Soaring Crane
2 1,511
A uniform electric field exists between parallel plates of equal but opposite charges. (Correct?) For electric field...
Jan24-07 11:31 PM
Soaring Crane
0 2,564
For Lenzís Law, most examples involve the north pole of a bar magnet passing through first in a wire coil, or...
Apr11-07 09:30 AM
8 20,156
In illustrating mutual inductance, there is a primary coil and a secondary coil, which houses an induced current. In...
Mar23-07 11:28 PM
10 2,760
The standard equation for motion is: X= .5 * ax * t^2 + vx * t (+ cx) Y= .5 * ay * t^2 + vy * t (+ cy) ...and...
Dec10-09 12:48 PM
2 2,758
hi, im new to this i hope someone can help i have a small problem with what formula i should use for my project ...
May16-11 06:28 PM
4 1,595
i have a satellite that has 8 places that are symmetrical for extra mass to be added to the satellite to help place...
Jan9-10 05:36 PM
0 1,796
if a humming bird is hovering in a car going at a constant rate, and the car comes to a sudden stop, will the bird fly...
May8-03 09:05 AM
9 1,493
Has anyone ever come across any research or articles concerning the effects of the initial blast and fallout of an...
Jun25-10 03:53 PM
1 959
I want to know in which types of problem this reduced mas μ=m1*m2/(m1+m2) is used . All i know that it is closely...
Oct9-11 03:47 AM
2 1,818
There is a parallel plate capacitor having capacity C. It initially has got no charge on it. Now we insert a...
Oct8-11 07:12 AM
11 4,718
Lets consider a block of mass m, sliding down an inclined surface (no friction) at an angle ∅ with ground. The force...
Oct12-11 08:04 PM
4 1,033
Problems related to conservation of momentum/energy can be solved by taking reference frame which is stationary to...
Oct8-11 01:39 PM
1 1,025
There's a metal plate with a circular hole/cavity in it. Consider its width negligible. Now the plate is uniformly...
Dec7-11 09:48 PM
4 1,451
Lets say if we have an induction motor or any motor whose rotating shaft acts as a source of alternating emf to...
Dec14-11 12:46 AM
11 1,747
As per II law of thermodynamics you it is NOT possible that a hotter body becomes hotter and colder body becomes...
Jan2-12 05:30 PM
2 1,093
Any problem of collision can be solved using four equations: Conservation of momentum and energy, impulsive forces...
Apr4-12 02:38 PM
5 1,818
It is known that light from stars bend near surface of sun due to its mass. Similarly light will bend near earth's...
Jul17-12 11:44 AM
4 614
I want to formulate an approx 2D ripple equation μ(x,y). It should satisfy following: 1) it should have highest...
Sep17-12 01:35 PM
4 1,090
I am doing a very amateur version of Tesla's experiment of using potential difference between positively charged sky (...
Sep14-13 02:54 AM
6 672
I'm simulating helicopter dynamics but would like to better visualize the behavior of the helicopter and so I'm...
Feb27-11 06:35 AM
1 817
Isn't mass basically one or more atoms (in part or in whole)?
Jun20-11 06:10 AM
32 3,935
"The meter is the length of the path traveled by light in vacuum during a time interval of 1/299,792,458 of a...
May23-11 01:54 AM
4 2,696
Blood is in continuous contact with itself. Thus any pressure on artery blood is pressure on vein blood. So they have...
Apr2-12 07:18 PM
10 5,630
How much error would I get if I used 9.8 m/s^2 as the acceleration for a falling object in an experiment? For example,...
Apr3-11 06:07 AM
3 1,159
I have to pick the best cell culture vessel: For my experiments, the vessel initially contains 0% CO2. Then it's...
Jul19-10 01:02 AM
1 1,064
A quick shortcut for problems that involve a weight (W) hanging from two cables with tensions T1 and T2 and angles A...
Jul7-11 02:36 AM
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