Recent content by johncena

  1. J

    Why Can't We Hear: Sound Traveling in Solids

    If sound travels faster in solids than in air then why on closing our ears we cannot hear the sound properly?
  2. J

    BTech PHYSICAL SCIENCES IIST: Get to NASA & ISRO Post-Grad

    What is the scope of btech in PHYSICAL SCIENCES from IIST(indian institute of space science and technology)? after that course it is compulsory to work in ISRO for 5 years...(if you get first class) will that be enough to get into NASA?
  3. J

    Calculating Total Number of Live Viruses after 10 Seconds

    Ohhhh...i missed that point... thanks sir...you was very helpful...
  4. J

    Help with a limit equation involving tangent

    divide numerator and denominator by x..
  5. J

    Calculating Total Number of Live Viruses after 10 Seconds

    Sir, i can't get you ... can you explain a bit more? you mean that no more viruses reproduce after 5 seconds?
  6. J

    Calculating Total Number of Live Viruses after 10 Seconds

    Homework Statement A virus give birth to 2 new virus in each second and life span of each virus is 5 seconds.The process of reproduction is continuous until the death of the virus.Initially there is one newly born virus at time t=0.Find the total number of live viruses just after 10 seconds...
  7. J

    Stuck with a problem in electrochemistry

    thank you sir... i am getting it now...:smile:
  8. J

    Stuck with a problem in electrochemistry

    Homework Statement A galvanic cell consisting of two silver electrodes,one in a saturated solution of AgBr and the other in a saturated solution of Ag2CrO4 is prepared.Calculate the value of Ecell at 298K Given Ksp(AgBr) = 5x10-13 M2 and Ksp(Ag2CrO4)=2.4x10-12M3 Homework Equations to...
  9. J

    What is the role of a salt bridge in a Daniell cell?

    What is the function of salt bridge in a daniell cell?Why KNO3 is used in salt bridge ?
  10. J

    Interior angles of a regular polygon

    The number of sides of two regular polygons are in the ratio 5:4 and the difference between their interior angles is 6 degrees.Find the number of sides of the two polygons. I forgot the relation between interior angles and the number of sides of a regular polygon.Can anyone help me to figure...
  11. J

    Is De Morgan's Law Always True?

    In my textbook, the proof for demorgan's law, (AintersectionB)* = A*unionB* [*=complement] starts with,saying that for all x belongs to (AintersectionB)* , x is not a member of AunionB. But how can we say that, for example, if A = {1,2,3} and B = (2,3,4,5} and U = {1,2,3,4,5}...
  12. J

    How the charges are transferred?

    why does that happen or how does that happen ?
  13. J

    How the charges are transferred?

    "When we touch a pith ball with an electrified plastic rod, some of the negative charges on the rod are transferred to the pith ball and it also gets charged." I want to know how does this happen ?
  14. J

    Can Rediscovering Curiosity Help Achieve Academic Dreams?

    I'm afraid whether this place is best to post my question.But i need a help as soon as possible.At first,i was very curious to know things or to investigate more about the world. Studying was not at all a burden for me. It was almost a spontanoeus process that i used to read books and i didn't...
  15. J

    Isolated System: Exploring Charge Conservation

    "The charge of an isolated system is conserved" What is the meaning of isolated system ?
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