Then I ask a second question. Is it possible to get one periodic element from another? Most of the people do not fully understand the meaning but some give the right answer - "Yes, it is called nuclear reaction" and almost immediately come to realisation - it was the same question asked twice. Lead and gold are both metals, both from periodic table.

According to both Bohr’s atomic and quantum mechanical models, the difference between lead and gold is three protons in atom nucleus. If we remove those extra protons from lead nucleus we get an atom of gold and some energy. Unfortunately we do not have the know-how to exercise that kind of control, yet.

I don’t think that synthetic gold will be financially feasible, but we are already running short of some rear earth metals, that shortage holds back our technological advance. Alchemy also, can be a good alternative or supplement to asteroid mining … ]]>

I'm just beginning physics and I'm having some trouble. Even when I get the right answers they just don't feel correct or entirely complete. I'm just hoping someone can let me know if I did this right, and what I could do to add to it if necessary. I apologize for the messiness I couldn't find symbols, I hope it is clear enough.

A hollow tube chime is open at both ends, the chime is 0.54m in length, the speed of sound is 346m/s.

L = wavelength/2

0.54m = wavelength/2

2(0.54m) = wavelength

1.08m = wavelength

third resonant length: L3

L3 = 3(wavelength)/2

L3 = 3(1.08m)/2

L3 =1.62m

third resonant length: 1.62m

f = v/wavelength

= 346/1.62

= 213.58 Hz

frequency of third resonant length: 213.58 Hz

Thanks very much for your help. ]]>

I do not have much knowledge about this stuff (just basic things), but I need to know something.

How do I calculate, how many cooling elements (bags of ice) do I need to maintain the temperature products (0°C-4°C) inside an isolated box for 24 hours? Depends on the cooling elements area.

Outside temperature: 25°C

Cooling element size: L x H x W = 16 x 13 x 3 cm

Thank you. ]]>

A uniform solid cylinder with mass M and radius R has rolled up a string. The string runs through a pulley with negligible mass.

a)Calculate the acceleration of mass m

b)Discuss the conditions under which the cylinder slides while rotating

could any one help me to solve this problem? ]]>

A mass of gas occupying volume V1 = 2 m3 at the pressure P1 = 4*10^5 Pa performs the cycle represented in the Figure that i have uploaded.What is the work of gas in this cycle, knowing that the pressure P2 = 10^5 Pa

2. Relevant equations

Work=1/2 * (P1 - P2) * (V1 - V3)

3. The attempt at a solution

The work is the area within the triangle.

1/2 base * height

= 1/2 * (P1 - P2) * (V1 - V3)

The question that i have is how do i find V3?

SORRY FOR BAD ENGLISHHH

Again , could any one help me to solve the attached problem ?

Thanks in advance

Razi

In this video on electromagnetism from about 18:20 the lecturer derives the potential on a dipole. In deriving an approximation for large distances from dipole he makes a step (at about 20:50) I can't fathom. It looks similar to a MacClurin series but I'm not seeing how he got the q/(4*pi*eps0*r^2*(1+a/r+a^2/r^2 +...) expression. Can anyone else see it? ]]>

How do I decide on the height, the required pressure difference and the relevant flow rate? ]]>

P.S. I have to write a 1500 word essay on it. ]]>

I have attempted the attached problem;

The issue I has is I've seen it done 2 ways;

1. Calculate the proper time for the period of the clock then convert that time to the time that passes in the observers reference frame... This gives 42 ns.

I believe this method to be correct.

2. The second method I've seen used (which I believe must be incorrect) is to calculate the length the observer would see for the clock using 5m as the proper length. (comes out to be 4m) Then use t=d/c to calculate the time the observer would see light take to complete the distance. this results in a different answer.

My question is why does the second method (I'm assuming that's the incorrect approach) not work?

I'm convinced there's something I'm overlooking here I just need some help figuring out what?

Many thanks in advance.

Could any one help me to find the suitable procedure to solve the attached problem ? i will thankful for him.

Best regards

Razi

https://www.scribd.com/document/3496...rgy-Prop-to-SL

I am using a picture upload because I could not find a way to write math signs. Please view the picture upload for the question.

2)what energy field was at work during the recombination of fundamental particles during the early universe?

3)what is the entropy of the universe before the big bang?

4)what is the energy structure of space-time? ]]>