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From: ratchetReply 1 of 22Reply
Subject: Contributed Answer/Explanation to Q. 37
   This happens because the frquency of the applied repeated periodic forced
   vibrations becomes equal to the natural frequency of the rare view mirror

Posted at: Sun Dec 27 16:28:14 2009 (GMT)

From: ratchetReply 2 of 22Reply
Subject: Contributed Answer/Explanation to Q. 38
   The name of the phenomenon taking place is resonance

Posted at: Sun Dec 27 16:29:21 2009 (GMT)

From: ratchetReply 3 of 22Reply         View replies (1)
Subject: Contributed Answer/Explanation to Q. 39
   In order to stop the violent vibrations we 

Posted at: Sun Dec 27 16:30:39 2009 (GMT)

From: ratchetReply 4 of 22Reply
Subject: Contributed Answer/Explanation to Q. 39
   In order to stop the violent vibrations we can change the speed of the motor
   bike or by tightening the screw of the rare view mirror

Posted at: Sun Dec 27 16:32:04 2009 (GMT)

From: sourimaReply 5 of 22Reply
Subject: Contributed Answer/Explanation to Q. 1
   1:1
   
   momentum for 1st body=20*5=100kg m\s^2
   
   
   momentum of 2nd body=5*20=100kgm\s^2
   
   
   therefore,ratio=1:1

Posted at: Thu Jan 7 17:30:00 2010 (GMT)

From: ishan20Reply 6 of 22Reply
Subject: Contributed Answer/Explanation to Q. 8
   focal length

Posted at: Mon Jan 18 02:31:48 2010 (GMT)

From: abirghosh050793Reply 7 of 22Reply         View replies (1)
Subject: Contributed Answer/Explanation to Q. 1
   1 : 1
   
   mp = 20 kg
   
   
   vp  = 5 m/s
   
   
   mq = 5 m/s
   
   
   vq   = 20 kg
   
   
   Ratio of the momenta of P and Q = mpvp  :  mqvq  = 20 x 5 : 5 x 20 = 1 :
   1

Posted at: Tue Feb 9 11:47:38 2010 (GMT)

From: abirghosh050793Reply 8 of 22Reply
Subject: Contributed Answer/Explanation to Q. 1
   1 : 1
   
   mp = 20 kg 
   
   
   vp  = 5 m/s 
   
   
   mq = 5 m/s 
   
   
   vq   = 20 kg 
   
   
   Ratio of the momenta of P and Q = mpvp  :  mqvq  = 20 x 5 : 5 x 20 = 1 :
   1 

Posted at: Tue Feb 9 11:48:50 2010 (GMT)

From: abirghosh050793Reply 9 of 22Reply
Subject: Contributed Answer/Explanation to Q. 2
   500 J
   
   mp = 20 kg 
   
   
   vp  = 5 m/s 
   
   
   Kinetic Energy of P  = 1/2  mp (vp) 2 = 20 x 5 x 5 J = 500 J

Posted at: Tue Feb 9 11:53:15 2010 (GMT)

From: abirghosh050793Reply 10 of 22Reply         View replies (1)
Subject: Contributed Answer/Explanation to Q. 3
   Fire tongs is an example of third class lever.
   MA = 
   
	   
		   
			   Effort Arm  
		   
		   
			    Load Arm

Posted at: Tue Feb 9 11:56:46 2010 (GMT)

From: abirghosh050793Reply 11 of 22Reply
Subject: Contributed Answer/Explanation to Q. 3
   Fire tongs is an example of third class lever.
   <p>
   MA = Effort Arm / Load Arm
   </p>
   <p>
   For a third class lever, effort is in between fulcrum and load, so,
   </p>
   <p>
   Effort arm < Load arm
   </p>
   <p>
   => MA < 1
   </p>

Posted at: Tue Feb 9 11:58:09 2010 (GMT)

From: abirghosh050793Reply 12 of 22Reply
Subject: Contributed Answer/Explanation to Q. 4
   In vacuum
   Spring balance measures weight, not mass. In air weight of a body will be
   less than in vacuum due to the buoyancy of air.

Posted at: Tue Feb 9 11:59:26 2010 (GMT)

From: abirghosh050793Reply 13 of 22Reply
Subject: Contributed Answer/Explanation to Q. 6
   It is because the specific latent heat of vaporisation of water is much
   higher than its specific heat capacity.
   
   Specific heat capacity of water = 4.2 J/g/oC
   
   
   Specific latent heat of vaporisation = 2268 J/g
   
   
   Heat needed to bring 'm' g of water to its boiling point from room
   temperature (25oC) = m x 4.2 x (100 - 25) J = 315 m J
   
   
   Heat needed to boil off 'm' g of water = m x 2268 J = 2268 m J
   
   
   Let the power be P. 
   
   
   Time taken to bring 'm' g of water to its boiling point from room
   temperature (25oC)  = 315 m / P
   
   
   Time taken to boil off 'm' g of water = 2268 m / P
   
   
   Obviously, 2268 m / P is greater than 315 m / P.

Posted at: Tue Feb 9 12:08:29 2010 (GMT)

From: abirghosh050793Reply 14 of 22Reply
Subject: Contributed Answer/Explanation to Q. 8
   Focal Length
   Only rays starting from the focus, after refraction emerges parallel to the
   principal axis and fall normally on the plane mirror to get reflected back
   in the same path. Thus the image is formed also on the focus. So, S is the
   focus, and OS is the focal length

Posted at: Tue Feb 9 12:11:16 2010 (GMT)

From: abirghosh050793Reply 15 of 22Reply
Subject: Contributed Answer/Explanation to Q. 9
   on S
   Here the phenonmenon of the return of the rays to their starting point is
   independent of the distance between the lens and plane mirror.

Posted at: Tue Feb 9 12:12:47 2010 (GMT)

From: abirghosh050793Reply 16 of 22Reply
Subject: Contributed Answer/Explanation to Q. 10
   A piece of red-cloth appears red in white light because it absorbs blue and
   green, and reflects only red.
   White light mainly contains red green and blue colours. Anything which
   absorbs blue and green, and reflects only red, will appear red in white
   light as only red colour reaches our eyes.

Posted at: Tue Feb 9 12:15:21 2010 (GMT)

From: abirghosh050793Reply 17 of 22Reply
Subject: Contributed Answer/Explanation to Q. 12
   The far point of a normal person lie on the retina of his eyes, but for a
   myopic person it lies in front of the retina 
   
   For a normal person the rays of light from a distant is focussed on the
   retina, facilitating clear vision, but for a myopic person, the rays are
   focussed in front of the retina, thus making distant vision blurred.

Posted at: Tue Feb 9 12:17:53 2010 (GMT)

From: abirghosh050793Reply 18 of 22Reply
Subject: Contributed Answer/Explanation to Q. 14
   No
   Quality does not depend on the pitch, but on the waveform. If two different
   persons play even on identical guitars, the number of ubsidiary notes
   produced by them and their relative amplitudes with the principal note will
   not exactly match. So, the quality of their sounds will differ, even if they
   play notes of the same pitch.

Posted at: Tue Feb 9 12:21:17 2010 (GMT)

From: shafeek47Reply 19 of 22Reply
Subject: Contributed Answer/Explanation to Q. 1
   1:1

Posted at: Mon May 10 16:41:34 2010 (GMT)

From: utsav13Reply 20 of 22Reply
Subject: Contributed Answer/Explanation to Q. 2
   250 Joules
   1/2 x 20 x 5 x 5 = 250 joules

Posted at: Fri Feb 25 13:31:38 2011 (GMT)

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