Physics - April 2007

please see this link http://sit.edu.pk/question/Mesh%20Analysis_Q1.doc

2007-04-24 09:44:38 · 3 answers · asked by medious009 1

Q:
Explain how alfa and beta-particles may ionize an atom without directly hitting the electrons? What is the difference in the action of th two particles for producting ionization?


(Note: Details, please!)

2007-04-24 09:22:29 · 5 answers · asked by Khan 2

2007-04-24 09:17:05 · 7 answers · asked by theresa_xo92 2

2007-04-24 09:13:47 · 8 answers · asked by Jared M 1

A 1.1 kg mass is attached to a spring with a force constant of 56 N/m. If the mass is released with a speed of 0.27 m/s at a distance of 9.7 cm from the equilibrium position of the spring, what is its speed when it is halfway to the equilibrium position?

2007-04-24 09:06:10 · 1 answers · asked by blazedup145 1

2007-04-24 08:58:23 · 6 answers · asked by Corey G 1

A particle of mass m can move freely on a horizontal frictionless surface. It is connected by a spring to a fixed point which can pivot freely; the spring is of natural length L and spring constant k. If the particle undergoes circular motion given by polar coordinates:-

R = P0 and theta = wt

where P0 and w are constants.

Q1. write down the equation of motion of the partical and find the equilibrium radial coordinate P0 in terms of m,k and w.

Q2. If the particle is made to undergo small radial perturbations to this equilibrium: R = P0 + z with theta = wt, derive an equation for the time dependence of z and hence show that if k >w^2, the particle unergoes radial oscillations and find their period.

I really don't know where to start with these questions, I understand the circular motion but don't know how the spring affects it.

2007-04-24 08:51:48 · 2 answers · asked by Dan 1

Cumulative action anti-tank missile consists of two blocks
of explosives lined with metal plates inclined by angle α to each other.
When missile moving with speed Va = 500 m/s
hits the armor, the exoplosives are detonated, and the plates
are propelled towards each other, with equal speeds Vo = 1000 m/s.

http://alexandersemenov.tripod.com/jet/index.htm

The plates collide and produce cumulative jet moving
with speed Vj, which easily pierces the armor.

What should be the value of angle α to achieve relative
velocity of the jet with respect to the armor Vj + Va = 5,000 m/s?

Assume that metal plates behave like ideal incompressible fluid.

Cross-section of real warhead can be seen here:
http://www.inert-ord.net/atrkts/bazoo/

2007-04-24 08:49:14 · 1 answers · asked by Alexander 6

2007-04-24 08:43:18 · 3 answers · asked by L B 1

Well does it?

2007-04-24 08:28:22 · 8 answers · asked by Anonymous

2007-04-24 08:16:03 · 2 answers · asked by Anonymous

My understanding is that this is a law of physics. Which scientists did the work on this law? How were they able to prove this? Any help would be greatly apprecitated!

2007-04-24 08:03:54 · 7 answers · asked by ape54321 2

2007-04-24 08:02:43 · 9 answers · asked by jazboat007 1

2007-04-24 07:52:43 · 22 answers · asked by jimmyobee 1

2007-04-24 07:41:15 · 7 answers · asked by christy r 1

its characteristic frequency. Since nothing is causing air pressure, forcing air into the whistle, it must be that the energy to sound the whistle is taken from the initial impetus of the arrow. The loss of energy must produce an effect similar to an increase in drag, or air resistance.

How much less distance is the arrow likely to travel than a similar arrow (equal mass) fired without a whistle?

Will it be noticeable? Or insignificant?

2007-04-24 07:23:52 · 2 answers · asked by cdf-rom 7

the same.

Do you float and swim more easily (because the gravity is less),

OR

do you tend to sink and must work harder to stay on the surface (because you are denser than an equal volume of water under the reduced gravity)?

[Yes, there's enough air to breathe for purposes of this discussion.]

Thanks for all serious answers!

2007-04-24 07:14:53 · 5 answers · asked by cdf-rom 7

Since it got corrected, it never existed, but since it never existed, you couldn't go back in time to correct it, but then, you never went back in time, and it never got corrected?
Would the universe explode?

2007-04-24 06:35:22 · 8 answers · asked by Doctor Orenthol 2

If Black holes are theorized to bring time to a stand still or close to it, consider the effects of the entire universe just after the point of singularity.

Could the time between singularity and the grand unification epoch have lasted for some other length of time? ex 1 trillion years.

2007-04-24 06:29:28 · 2 answers · asked by Telemon 3

2007-04-24 06:15:48 · 5 answers · asked by Anonymous

by 3.40 x 10^-5 m. what is the angle corresponding to the second dark fringe?

2007-04-24 05:57:06 · 1 answers · asked by Anonymous

2007-04-24 05:51:03 · 8 answers · asked by Anonymous

2007-04-24 05:49:47 · 4 answers · asked by Zeed 1

of the reflection?

2007-04-24 05:48:29 · 3 answers · asked by Anonymous

Why is this statement false " carrots help you to see in the dark" please explain in good detail

2007-04-24 05:46:16 · 7 answers · asked by Emma 1

What are some kinds of thermal light?

I'm totally stumped! Can you help me? Please?

2007-04-24 05:44:46 · 1 answers · asked by Anonymous

point A?

2007-04-24 05:37:00 · 2 answers · asked by pooja s 1

2007-04-24 05:32:07 · 3 answers · asked by Anonymous

Could you give me some applications of Newton's law of cooling? Also a little discussion on these on these applications...

Thanks a lot in advance!

2007-04-24 04:53:43 · 1 answers · asked by pristane 1

The following question may be on my final. I have looked in our text, but I just can not find this answer. Can someone please help...

The central cores of massive main sequence stars
a. produce energy by the proton-proton chain.
b. have a very low opacity.
c. transmit energy outward by convection.
d. burn their nuclear fuels more slowly than low mass main sequence stars.
e. have lower temperatures than the central cores of low mass main sequence stars.

2007-04-24 04:49:41 · 2 answers · asked by Pete S 1