Physics - November 2007

What is the average pressure on the soles of the feet of a standing 89-kg person due to the contact force with the floor? Each foot has a surface area of 0.021 m2.

This has been on here before but the answer was not working for me. If you could help me out that would be great.

Also, the answer is expressed in kPa.

2007-11-01 08:35:50 · 1 answers · asked by burning_ice_73 2

An aluminum cylinder weighs 1.01 N. When this same cylinder is completely submerged in alcohol, the volume of the displaced alcohol is 3.86 × 10-5 m3. The apparent weight of the cylinder when completely submerged is 0.731 N. What is the specific gravity of the alcohol?

2007-11-01 08:35:43 · 2 answers · asked by Bob P 1

2007-11-01 07:16:08 · 5 answers · asked by Sarah. 1

We now 3 dimensions right? I heard on TV that there could be up to 18 more, plz enlighten me of what they could be

2007-11-01 06:38:18 · 4 answers · asked by Anonymous

i need to do an essay

2007-11-01 06:33:09 · 1 answers · asked by greg_mrcs 1

Please give me answers in ways it possibly can be destroyed.

2007-11-01 06:30:00 · 6 answers · asked by Anonymous

In the plastic bird that balances on the tip of its beak, The little birds that stand on their beak, that you can buy at any store, it will balance on its stand or you can balance it on any surface with only the tip of its beak touching.

2007-11-01 05:47:45 · 2 answers · asked by Pascal 4

A simple pendulum, 0.855 m long, is held at rest so that its amplitude will be 0.245 m. Neglecting friction and air resistance, use energy concepts to determine the maximum speed of the pendulum bob after release.
Energy concept==> Etotal = Epotential + Ekinetic
Et = mgh + 1/2mv^2

2007-11-01 04:57:20 · 2 answers · asked by mahdi_end2006 2

If electron has momentum p, then
its waveleghth is λ=h/p,
and its frequency is f = E/h.

The velocity of de Broglie wave is
u = λf = h/p E/h = E/p = 1/2 p²/m /p = 1/2 p/m.

Should not velocity of electron be v = p/m?

2007-11-01 04:24:03 · 4 answers · asked by Alexander 6

2007-11-01 04:07:16 · 3 answers · asked by Anonymous

I live overseas so a tutor is pretty much out of the question for me. Can anyone recommend any good books or websites that are interesting for beginners? Thank you in advance for your help.

2007-11-01 03:01:50 · 7 answers · asked by Anonymous

When we travel by car or a bus down the ghat road or a slope bridge, we have a feeling of stomach being pulled down or a hollow effect for a moment? There must be a science behind it. Please try to answer my question or clarify this point!

2007-11-01 02:33:37 · 2 answers · asked by V. SIVAGANGAILAKSHMI 1

First off...I have always been told that NOTHING can escape a black hole. But, in my experience, I have found that there is usually at least one loophole, or exception to the rule, in everything.

I saw a documentary the other night on PBS about neutrino detection and learned that they were not (or hardly at all) affected by electromagnetism and gravity. And that they could travel through matter almost completely undisturbed. This got me thinking about if they could potentially escape, or at least be minimally disturbed, by black holes. Or maybe even pass straight through them completely undisturbed.

My understanding of black holes is that they have an immense gravity and nothing as of yet can be proven to escape them. But my understanding of gravity is that anything with a mass will be affected by it. So...if neutrinos have (practically) zero mass, and they have been proven to not be (practically) affected by gravity, what would happen near a black hole

2007-11-01 01:45:09 · 6 answers · asked by Toledo Engineer 6

I just wasnt sure if it can be calculated in calender years.

2007-11-01 00:46:12 · 7 answers · asked by Anonymous

Just being curious

2007-11-01 00:45:05 · 2 answers · asked by Anonymous

1) Looking at the equation for intensity I=4(I sub o)cos(pi*d*y/wavelength*L)^2, as you increase the distance between the screen and the 2 slits why does intensity increase?

2) Also if you increase the slit width, by the equation, the intensity doesn't change. Intuitively I thought it should change intensity somehow.

3)If you increase only one slit width of the two slits, the intensity should be skewed somehow. How is it changed?

2007-11-01 00:11:18 · 1 answers · asked by Anonymous