Search results

  1. Y

    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...
  2. Y

    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...
  3. Y

    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...
  4. Y

    Question on Momentum

    We know that momentum of a closed or isolated system is always conserved . Now for INELASTIC collision, lets 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...
  5. Y

    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...
  6. Y

    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...
  7. Y

    Comparing work done(Please help me mark my concept)

    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...
  8. Y

    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...
  9. Y

    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...
  10. Y

    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...
  11. Y

    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...
  12. Y

    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...
  13. Y

    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!
  14. Y

    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...
  15. Y

    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...
  16. Y

    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...
  17. Y

    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??
  18. Y

    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...
  19. Y

    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
  20. Y

    What is special about the Avogadro's Constant ?

    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...
  21. Y

    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...
  22. Y

    I want to be a physicist.

    If i currently study in Secondary School and will soon graduate to PreUniversity level, which way should i choose?
  23. Y

    Object At Principle Focus !

    Concerning the Convex Lens and my diagram attached, when an object is placed exactly at the principle focus (focal point) of the convex lens, if we apply the concept of Light Ray Diagram, the Principle Ray and Centre Ray after refraction does not intersect. From here, with 2 refracted ray...
  24. Y

    As i know, the metallic structure for example a pure copper metal

    As i know, the metallic structure for example a pure copper metal which is made up of all metal atoms that is the copper atoms actually have all its atom of metallic element bonded together by metallic bonding. Metallic bonding is the electrostatic force of attraction between the positively...
  25. Y

    Impurities on melting point and boiling point of water

    When impurities was added to the water, it tends to increase the boiling point of the water to 102 degree celcius and lower the melting point of the water to -2 degree celcius! Why this happen? Is it because the impurities tends to absorb the heat supplied to boil the water causing it to take in...
  26. Y

    M1.m2 = -1 ?

    M1.m2 = -1 ?? Why is the product of the gradients of 2 straight line perpendicular to each other is always equal to -1 ?? Is there any theory to explain this ??
  27. Y

    Relative atomic mass

    Can somebody please explain for me ??
  28. Y

    What is probability?

    What is probability?? If i have 1 objective question with four multiple choices. The probability of getting 1 question correct is 1/4. But how if i did 4 question, the probability of getting 1 question correct = 1. What is meant by that?? That means i definitely will have one question done...
  29. Y

    Help me on transistor

    Help me on transistor !!! What is the difference on NPN and PNP transistor ???
  30. Y

    Why there is no current flowsin a reverse-biased arrangement?

    Why there is no current flowsin a reverse-biased arrangement?? Once the polarity of the external voltage is the same as that of the junction voltage, electrons from the P-TYPE semiconductor will flow out and be attracted towards the positive terminal of the battery and then to the p-type...
Top