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From: poulomi24Reply 1 of 22Reply
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: gauravshah10Reply 2 of 22Reply
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_naikReply 3 of 22Reply
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_naikReply 4 of 22Reply
Subject: Contributed Answer/Explanation to Q. 53
   alpha rays

Posted at: Sun Mar 7 13:48:03 2010 (GMT)

From: abhishek100031Reply 5 of 22Reply
Subject: Contributed Answer/Explanation to Q. 9
   45,90

Posted at: Wed Apr 21 10:49:21 2010 (GMT)

From: abhishek100031Reply 6 of 22Reply
Subject: Contributed Answer/Explanation to Q. 37
   answer=
    2 × 108

Posted at: Wed Apr 21 10:53:19 2010 (GMT)

From: abhishek100031Reply 7 of 22Reply
Subject: Contributed Answer/Explanation to Q. 39
   Total internal reflection

Posted at: Wed Apr 21 10:56:01 2010 (GMT)

From: harsimranReply 8 of 22Reply
Subject: Contributed Answer/Explanation to Q. 4
   1:1

Posted at: Tue Sep 28 11:51:52 2010 (GMT)

From: harsimranReply 9 of 22Reply
Subject: Contributed Answer/Explanation to Q. 5
   1:2

Posted at: Tue Sep 28 11:52:43 2010 (GMT)

From: harsimranReply 10 of 22Reply         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: harsimranReply 11 of 22Reply
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: harsimranReply 12 of 22Reply
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: harsimranReply 13 of 22Reply
Subject: Contributed Answer/Explanation to Q. 35
   convex lens

Posted at: Tue Sep 28 12:00:56 2010 (GMT)

From: harsimranReply 14 of 22Reply
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: aakshikaReply 15 of 22Reply
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: wwwwwReply 16 of 22Reply
Subject: Contributed Answer/Explanation to Q. 10
   ans
   
   except yellow all other

Posted at: Sat Dec 25 17:31:17 2010 (GMT)

From: wwwwwReply 17 of 22Reply
Subject: Contributed Answer/Explanation to Q. 10
   except yellow all others colors

Posted at: Sat Dec 25 17:32:32 2010 (GMT)

From: subhasreeReply 18 of 22Reply
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: subhasreeReply 19 of 22Reply
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: gud1Reply 20 of 22Reply
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)

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