# Search results

1. ### Specific heat capacity

wow thanks a lot! it is sufficient for me already as a pre u student.
2. ### Specific heat capacity

Now consider two objects,A and B. A has a higher specific heat capacity that B. When both object is subjected to same amount of thermal or heat energy, rise in temperature in A is lower as our common reason(A has a higher specific heat capacity) But what stated by First law of thermodynamics...
3. ### Banked curve curcular motion

hello good morning. Let look at the two diagram. (back view) In STATIC, a car is remauning static at a bank curve and its force diagram is as follows. for this case, the normal force is smaller than the weight of the car and friction exists in the directiin perpendicular to car. In MOTION...
4. ### Cure for cough

I get to know from some website that stewing a mixture of banana, crystal sugar(not a candy!)and some water can for two hours can yield a soup that cure cough if consume together with the banana stewed. Is there an experimental scientific proof that this method of curing cough leave no side...
5. ### Question on Momentum

Hmm, now there still seems like somethings is absent. It there a theoretical prove that total momentum is conserved also?
6. ### Question on Momentum

Now, I gt another question, for a closed.system, if inelastic collision where kinetic energy is lost occurs between particles, surely the total kinetic energy before must be less than after one right?? the kinetic energy might be lost to the system as other form of energy, bt in this case the...
7. ### Question on Momentum

We know that momentum of a closed or isolated system is always conserved . Now for INELASTIC collision, let's make It simple,consider a system with only two moving particles. If they collide inelastically, we know that energy is surely lost! now the system is no longer a closed system right...
8. ### Voltage across voltmeter

Thanks for you guiding too. actually I know this type of arrangement is odd,but I purposely arrange in tis way to study d the operation of voltmeter. Thanks by the way.
9. ### Voltage across voltmeter

Thanks for your concern very much . I hav gt my answer. Thanks a lot.
10. ### Voltage across voltmeter

Now for this case when the voltmeter is not a ideal one, a small current is flowing. The voltmeter reading equal to the potential difference across itself (10V) and not emf of the battery(12V) . This happens because there is current flowing through the whole circuit, causing IR to exist across...
11. ### Voltage across components in a zero-current circuit

Thanks for your guide. Another question,for caseA,what is the potential difference across the internal resistance n the Diode??
12. ### Voltage across components in a zero-current circuit

Hi i am having some obstacles in building up my concept in dc circuit First of all, as we know, voltmeter is made up of a series circuit with both ends connected to two points of other circuits, while inside the series circuit, a galvanometer and resistor is connected in series. How the...

Thanks a lot. U help me a lot.

For both situation, the person oh the ship is pulling the rope with a particular constant magnitude of force, F for a fixed duration, t. Because the medium of force F is a light inextensible rope, so force doing work is in the form of tension. Treat both the person and the boat as an entity and...
15. ### Ionic bond vs covalent bond.

Thanks a lot i got my answer! Bt may i ask further? If we are using this concept to explain the bond energy of HF and HI, then instead of explaining in term of bond length, can we say that the more polar covalent bond of HF lead to higher ionic character and so a greater bond strength?? Thanks a...
16. ### Ionic bond vs covalent bond.

As i know chemical bonding can be considered as a spectrum of bond ranging from covalent to ionic. Now can we say that ionic bond is harder than covalent bond?? Since covalent bond is a result of attractive n repulsive bt ionic only attractive . If it does, instead of bond length factor, HF...
17. ### Symmetry of Cubic Function

Thank you very much. U r inspiring .
18. ### Symmetry of Cubic Function

As we know, a quadratic function can be expressed in a form of complete square by a method of completing the square. This form enables us to prove that a quadratic equation is symmetric about its stationary point. But for the cubic function, is there a similar way to prove that the cubic curve...
19. ### Effective Nuclear Charge

I calculated the same thing also. If our calculation are correct ,that means the effective nuclear charge is increasing and then go to constant. But many books wrote that the effective nuclear charge is decreasing down the group. Or could you please share with me your knowledge and...
20. ### Effective Nuclear Charge

I have come across the Slater's Rules that is used to calculate the numerical value of effective nuclear charge of elements. Can somebody please show to me the calculation of effective nuclear charge of atoms of element down the group 2 by using the Slater's rule?? I calculate by using the...
21. ### Gravitational field Strength Inside the Earth

Since the Gravitational Attractive Force is given by, F_g=(Gm_1 m_2)/r^2 Let m_1be the minor mass of a small body (e.g. human) let m_2 be the massive mass of a huge spherically symmetric body (e.g. Earth) Let r be the...
22. ### Derivative of the exponential function with base e

Thanks a lot! you really inspiring me!
23. ### Derivative of the exponential function with base e

For an exponential function of the form y=a^x First derivative , d/dx [a^x ] = a^x∙ lim┬(δx→0)⁡{(a^δx-a^0)/δx} = a^x∙ m_((0,1)) now if m_((0,1)) which is the gradient of the y-axis intersection point of the exponential function equal to 1 exactly...
24. ### Any proof for the CHAIN RULE ?

Thanks guys, i will look at that first.
25. ### Any proof for the CHAIN RULE ?

Any proof for the CHAIN RULE ?? Can somebody please show me the proof of the chain rule?? even though i have been applying that concept since i touch differentiation but i still have doubt and question on this concept!
26. ### Simplification of a rational polynomial function

Thanks for your reply. Now, Let’s look at this function again. y=((x+1))/((x+1)(x-1)) . Aren’t this function can be simplified by multiplying both the numerator and denominator by 1/((x+1) ) ?? So this y=((x+1))/((x+1)(x-1)) = 1/(x-1). Is it true?? Are this 2 function equal and equivalent? or...
27. ### Simplification of a rational polynomial function

Now if I have a function y=(ab+ac)/a, it can be further factorised, y=(a(b+c))/a. Now if we cancel off the a, we will have only y=b+c that will also give the same y-values as the original form of the function y with respect to the same x-value. This statement implies that cancellation or...
28. ### Resolution of Forces

Yes sir. Sorry because i faced problem in uploading photo as attachment. So there is a need for me to create another thread.:smile:
29. ### Basic concept on vector

Guys i really need your zealous help! It is a simple concept but i have some doubt on it. A vector can be resolve into its component vectors like unit vectors i,j & k. A single vector can be expressed into its i-components and j-components if it is a 2-dimensional vector. Is it when 2 vectors...
30. ### Resolution of Forces

I have been thinking about the logic of resolution of a main force into its component forces. Up to my stage i have just come across with the 2-dimension force which take x-axis and y-axis as their basis. So if they take y and x-axis as the basis for the components of a single force, supposedly...

32. ### Flexibility 2

1 = √(1) = √(-1)(-1) = (√-1)(√-1) = i.i = i^{2} = -1 Is this a correct equation?? anythings wrong with this? i think theoretically it is correct but it seems like √(1) = √(-1)(-1) √(1) = √(1)(1) also! so how to explain this??
33. ### Flexibility - multiple methods for solutions?

Flexibility -- multiple methods for solutions? I found that for some mathematical equations, for example quadratic equations or other equations where f(x)=0, the solutions for f(x)=0 could be 2 i we solve certain way and only 1 out of 2 if we use another method, somethings like changing the...
34. ### Heiseinbeg's Uncertainty Priciple and Schrodinger's eqt

Thanks very much.Indeed i still do not have strong base on quantum mechanics! Will ask you question soon !
35. ### Heiseinbeg's Uncertainty Priciple and Schrodinger's eqt

Can somebody please explain the basis for the Heiseinberg's Uncertainty Principle and the Schrodinger's Theory or me? I m confused with the movement of electron in the orbitals and i think these 2 theories are the key. Thanks

Can anyone please show me the working on calculation of relative isotopic mass of any isotope?? thanks a lot!

Thanks so much for your explanation. But could i say that my above attachment is only correct when both the carbon-12 isotope and oxygen-16 isotope are under the same condition, for example both are in isolated form, same temperature and all other possible factors that affects the mass? And one...

im sorry about that because frankly I am a A-level student. I have been studying the piece of information that you gave me . Up to this stage i can almost understand the mass defect. But i am still not satisfied with the statement"No other nuclides other than the carbon-12 isotopes have exactly...

a new question, is it true that the mass of an atom(atomic mass) is equal to the total mass of of all the protons, neutrons and electrons in that atom ?? and is that the mass of a atom is always constant ??

may i ask what does it means by the mass deficit ? and you mentioned that oxygen-16 isotope has a mass different from exactly 16 a.m.u. but i think oxygen-16 isotope should have a mass of exactly equal to 16.a.m.u. Could you please refer to the attachment i posted and help me to mark my...

sorry why it will not be a whole number ? wasn't chemist found that 6.02^23 hydrogen atoms will make up 1 g ? so for the atoms of other element which is n times heavier than one-twelfth of the mass of a carbon-12 isotope(or the mass of a hydrogen-1 atom = 1.66 x 10^-27 kg) supposed to have a...

What is special about the Avogadro's Constant ?? 6.0221367x10^23 is the avogrado's constant. Does this amount of substances just mean that 6.0221367x10^23 molecules or atoms in gaseous state arrangement will occupy a constant volume provided they are under the same condition(same temperature...
43. ### I want to be a physicist.

Very sorry about that. all right now i have completed my secondary school final examination(in Malaysia we call it SPM) and now is waiting or the result. my friend and i are so interested in the theory of physics plus math like calculus.. So I am worried where should i gt my bachelor of science...
44. ### Consequently the auxin diffuses uniformly downwards

Hai...Hai... Anyone know ??
45. ### Consequently the auxin diffuses uniformly downwards

Auxin [/SIZE]as the plant hormone produced by the apical meristem in the zone of cell division of shoot and root tends to escape from the sunlight. Now if the Zone of cell division(tips) of the shoot of the plant is totally covered from sunlight supposedly the horizontal diffusion of auxin in...
46. ### Object At Principle Focus !

Yea. Thanks a lot professor! I have got what i demand for.
47. ### Object At Principle Focus !

that means we will be able to see the image when the object is placed exactly at the focal point of the convex lens right ?
48. ### Object At Principle Focus !

come on professor. I really do not understand what you are trying to imply and i really need explanation from adorable people like you . I have attached the photo. My problem is will the 2 refracted rays intersect?
49. ### Object At Principle Focus !

Okay. By using the equation 1/o + 1/i = i/f. In this case the object distance,o is exactly equal to the focal length,f.(As in my attachment) so, 1/i = 0. Image distance,i = infinity . Is it ? And according to the picture, the 2 light rays on the left hand side of the lens is parallel right ?
50. ### I want to be a physicist.

Sorry. I mean should i go for A-levels which is orientated to oversea university ??