Recent content by johncena

  1. J

    High School 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

    Can a BTech from IIST lead to NASA after 5 years at ISRO?

    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

    Limit of (x³ - 2x² + x)/tan(x) as x approaches 0

    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

    Galvanic cell with AgBr and Ag2CrO4 electrodes

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

    Galvanic cell with AgBr and Ag2CrO4 electrodes

    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

    High School 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

    Undergrad 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

    High School How the charges are transferred?

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

    High School 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

    Undergrad What is an isolated system and its role in charge conservation?

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

    Undergrad Do vibrations of metal atoms produce electromagnetic waves when heated?

    When we heat a metal, the positive kernels begins to vibrate.Will this vibrations produce electromagnetic waves ?
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