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## Discussion topic: Contributed Answer/Explanation to Q. 29

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 Page 1 of 2  > From: poulomi24 Reply 1 of 22 Reply Subject: Contributed Answer/Explanation to Q. 29 ``` When a body is partially or wholly immersed in a liquid,it experiences a upward buoyant force,which is equal to the weight of the liquid displaced by the immersed part of the body. ```Posted at: Thu Mar 4 15:58:54 2010 (GMT) From: gauravshah10 Reply 2 of 22 Reply Subject: Contributed Answer/Explanation to Q. 14 ``` 1=1.2 number of waves produced in 1 second=frequency if the wave(f)  velocity(v)=24m/s wavelength(w)=20   v=f * w 24=f*20   f=24/20 f=1.2 ```Posted at: Sun Mar 7 08:47:58 2010 (GMT) From: priyanka_naik Reply 3 of 22 Reply Subject: Contributed Answer/Explanation to Q. 24 ``` the rate of change of momentum of a body is directly proportonal to the force applied on it and this change in momentum takes place in the direction of the force. f = ma ```Posted at: Sun Mar 7 11:04:31 2010 (GMT) From: priyanka_naik Reply 4 of 22 Reply Subject: Contributed Answer/Explanation to Q. 53 ``` alpha rays ```Posted at: Sun Mar 7 13:48:03 2010 (GMT) From: abhishek100031 Reply 5 of 22 Reply Subject: Contributed Answer/Explanation to Q. 9 ``` 45,90 ```Posted at: Wed Apr 21 10:49:21 2010 (GMT) From: abhishek100031 Reply 6 of 22 Reply Subject: Contributed Answer/Explanation to Q. 37 ``` answer=  2 × 108 ```Posted at: Wed Apr 21 10:53:19 2010 (GMT) From: abhishek100031 Reply 7 of 22 Reply Subject: Contributed Answer/Explanation to Q. 39 ``` Total internal reflection ```Posted at: Wed Apr 21 10:56:01 2010 (GMT) From: harsimran Reply 8 of 22 Reply Subject: Contributed Answer/Explanation to Q. 4 ``` 1:1 ```Posted at: Tue Sep 28 11:51:52 2010 (GMT) From: harsimran Reply 9 of 22 Reply Subject: Contributed Answer/Explanation to Q. 5 ``` 1:2 ```Posted at: Tue Sep 28 11:52:43 2010 (GMT) From: harsimran Reply 10 of 22 Reply View replies (1) Subject: Contributed Answer/Explanation to Q. 8 ``` it is defined as- critical angle is the angle of incidence corresponding to which the angle of refraction is 90. ```Posted at: Tue Sep 28 11:54:48 2010 (GMT) From: harsimran Reply 11 of 22 Reply Subject: Contributed Answer/Explanation to Q. 8 ``` it is defined as- critical angle is the angle of incidence in denser medium corresponding to which the angle of refraction in denser medium is 90. ```Posted at: Tue Sep 28 11:55:27 2010 (GMT) From: harsimran Reply 12 of 22 Reply Subject: Contributed Answer/Explanation to Q. 12 ``` SONAR stands for sound navigating and ranging.It is based on the principle of echo. ```Posted at: Tue Sep 28 11:57:04 2010 (GMT) From: harsimran Reply 13 of 22 Reply Subject: Contributed Answer/Explanation to Q. 35 ``` convex lens ```Posted at: Tue Sep 28 12:00:56 2010 (GMT) From: harsimran Reply 14 of 22 Reply Subject: Contributed Answer/Explanation to Q. 36 ``` The ratio of sine of angle of incidence to sine of angle of refraction is constant for the pair of given media.This constant is called the refractive index of second medium with respect to the first.This is called Snell's law. ```Posted at: Tue Sep 28 12:03:15 2010 (GMT) From: aakshika Reply 15 of 22 Reply Subject: Contributed Answer/Explanation to Q. 14 ``` 120 V=W.F 24=(20/100) .F 24=F/5 F=24*5=120 ```Posted at: Sun Dec 5 18:09:44 2010 (GMT) From: wwwww Reply 16 of 22 Reply Subject: Contributed Answer/Explanation to Q. 10 ``` ans except yellow all other ```Posted at: Sat Dec 25 17:31:17 2010 (GMT) From: wwwww Reply 17 of 22 Reply Subject: Contributed Answer/Explanation to Q. 10 ``` except yellow all others colors ```Posted at: Sat Dec 25 17:32:32 2010 (GMT) From: subhasree Reply 18 of 22 Reply Subject: Contributed Answer/Explanation to Q. 1 ``` so as to make the scissors a speed multiplier and the shear a force multipier. blades longer than handles signify that the effort arm is more than the load arm thus M.A. > 1 and due to which effort applied is less than the load.hence it is used as a speed multiplier.but in case of the shears it is just the reverse.```Posted at: Sun Jan 2 05:37:31 2011 (GMT) From: subhasree Reply 19 of 22 Reply Subject: Contributed Answer/Explanation to Q. 3 ``` kinetic to potential energy at the mean position it has kinetic energy while at the extreme position it has potential energy```Posted at: Sun Jan 2 05:42:38 2011 (GMT) From: gud1 Reply 20 of 22 Reply Subject: Contributed Answer/Explanation to Q. 6 ``` ....as below.... Because the molecules of ice on melting occupy the intermolecular spaces between the molecules of water,the level of water does not rise.```Posted at: Sun Jan 2 21:08:08 2011 (GMT) Page 1 of 2  >