ICSE − Q & A

Why amplitude is more when forced vibrations' frequency matches natural frequency(i.e. resonance)?

+ 1 more questions by akhooda  

In concise physics it is written that one can prove Newton's first and third laws of motion using his second law. I can prove the first one. Can anyone tell me how to prove the third law?
asked by Anurag Hooda (akhooda) 7 years ago
1

What is length of CERN tunnel in Geneva,Switzerland

In Newton's first law of motion.... Is it okay if we write it as.... unless an external "unbalanced" force is applied on it. This statement is right but will they deduct marks for it being not exactly same to the def. given in the text book?

How does resistance depend on the area of cross section of a conductor?

http://www.respaper.com/harshavvardhan/774/6557-zip.html q7 -c with answers reasons please

Is osterd's law there in syllabus?
If yes then please explain in short.

what is the energy change during respiration?pls answer asap

explain "critical angle of diamond is 24"

WORKING OF THE CRT
Loads of people have trouble understanding this so I thought I'd help make it a little simpler :] 

1) Filament heats the Cathode. 
2) Cathode gets charged and emits the electrons
3) Grid(situated between Anode and Cathode) directs the entry of electrons
4) Anode provides Kinetic energy to the electrons
5) Deflecting plates direct the electrons to the flourascent screen. 

This is the process of how an electrical signal is converted into a visual signal. Please correct me if I made any mistake. 
Hope I helped :]

Suresh applies a force of 6kgf to draw a 4.8kg bucket of water from a well using a single fixed pulley. Assuming all extra force is used to overcome frictional forces, calculate MA, VR, eff.
ans should be 0.8 MA, VR is 1 and eff. 80% right?