# Recent content by johncena

1. ### Why we can't hear ?

If sound travels faster in solids than in air then why on closing our ears we cannot hear the sound properly?
2. ### Can i get to NASA?

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. ### Number of live viruses

Ohhhh......i missed that point..... thanks sir.....you was very helpful.....
4. ### Help with a limit equation involving tangent

divide numerator and denominator by x..
5. ### Number of live viruses

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

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. ### Stuck with a problem in electrochemistry

thank you sir....... i am getting it now......:smile:
8. ### 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. ### Function of salt bridge

What is the function of salt bridge in a daniell cell?Why KNO3 is used in salt bridge ?
10. ### 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. ### De morgan's laws

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. ### How the charges are transferred?

why does that happen or how does that happen ?
13. ### 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. ### How to get back my curiosity

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. ### Isolated system

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