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From: ratchetReply 1 of 54Reply
Subject: Contributed Answer/Explanation to Q. 26
   Scissors

Posted at: Sun Feb 7 04:03:24 2010 (GMT)

From: ratchetReply 2 of 54Reply
Subject: Contributed Answer/Explanation to Q. 15
   Echoes are used in sonars to mfind the depth of the sea or to detect any
   sunken ships or submarines are present under the ship

Posted at: Sun Feb 7 04:41:24 2010 (GMT)

From: ratchetReply 3 of 54Reply
Subject: Contributed Answer/Explanation to Q. 27
   A machine with such charecterestics can be used gor a gain in speed

Posted at: Sun Feb 7 04:44:38 2010 (GMT)

From: mohit_shahReply 4 of 54Reply         View replies (2)
Subject: Contributed Answer/Explanation to Q. 1
   120N

Posted at: Mon Feb 22 11:16:12 2010 (GMT)

From: mohit_shahReply 5 of 54Reply
Subject: Contributed Answer/Explanation to Q. 1
   125

Posted at: Mon Feb 22 11:16:33 2010 (GMT)

From: mohit_shahReply 6 of 54Reply
Subject: Contributed Answer/Explanation to Q. 1
   120N

Posted at: Mon Feb 22 11:17:08 2010 (GMT)

From: haroonamanReply 7 of 54Reply
Subject: Contributed Answer/Explanation to Q. 1
   The weight of a body of mass 12 kg is :
   
   mass = 12 kg
   
   
   g = 10m/s2 
   
   
   ... f = m*g
   
   
        = 12*10
   
   
        = 120 kgm/s2 

Posted at: Sun Feb 28 16:34:38 2010 (GMT)

From: haroonamanReply 8 of 54Reply
Subject: Contributed Answer/Explanation to Q. 2
   To use a machine as a force multiplier the lever should preferably be a
   class 2 lever. An exaple of such a lever is a nutcracker or a crowbar.

Posted at: Sun Feb 28 16:40:26 2010 (GMT)

From: haroonamanReply 9 of 54Reply         View replies (1)
Subject: Contributed Answer/Explanation to Q. 3
   The pressure at a point in a liquid is a scalar quantity.

Posted at: Sun Feb 28 16:41:45 2010 (GMT)

From: haroonamanReply 10 of 54Reply
Subject: Contributed Answer/Explanation to Q. 3
   The pressure at a point in a liquid is a vector quantity.

Posted at: Sun Feb 28 16:44:25 2010 (GMT)

From: haroonamanReply 11 of 54Reply
Subject: Contributed Answer/Explanation to Q. 4
   When the water is heated the temperature of the water increases, the density
   of water decreases and aven the air bubbles in the piece of wood escapes and
   hence the piece of wood sinks.

Posted at: Sun Feb 28 16:50:07 2010 (GMT)

From: haroonamanReply 12 of 54Reply
Subject: Contributed Answer/Explanation to Q. 7
   The lens used is a convex lens.

Posted at: Sun Feb 28 16:51:37 2010 (GMT)

From: haroonamanReply 13 of 54Reply
Subject: Contributed Answer/Explanation to Q. 9
   Two characteristics of the image formed by the lens are that the image
   formed is real and inverted.

Posted at: Sun Feb 28 16:53:56 2010 (GMT)

From: haroonamanReply 14 of 54Reply
Subject: Contributed Answer/Explanation to Q. 10
   In day light an object appears red when seen through a red glass and black
   when seen through a blue glass as red and blue are primary colours and when
   they mix with day light it produces secondary colours like black.

Posted at: Sun Feb 28 16:57:56 2010 (GMT)

From: haroonamanReply 15 of 54Reply
Subject: Contributed Answer/Explanation to Q. 11
   The extreme colours in pure spectrum of light are violet and red.

Posted at: Sun Feb 28 16:58:51 2010 (GMT)

From: haroonamanReply 16 of 54Reply         View replies (1)
Subject: Contributed Answer/Explanation to Q. 12
   One feels ice-cream at 0°C is colder than water at 0°C as ice has a heat
   capacity of 336J/g/c which is higher than water's specific heat capacity of
   4.2J/g/c.

Posted at: Sun Feb 28 17:02:58 2010 (GMT)

From: haroonamanReply 17 of 54Reply
Subject: Contributed Answer/Explanation to Q. 12
   One feels ice-cream at 0°C is colder than water at 0°C as ice has a heat
   capacity of 336J/g/c which is higher than water's specific heat capacity of
   4.2J/g/c and hence ice absorbs more energy and hence ice cream is colder
   than water.

Posted at: Sun Feb 28 17:04:02 2010 (GMT)

From: haroonamanReply 18 of 54Reply         View replies (1)
Subject: Contributed Answer/Explanation to Q. 14
   One example of natural vibrations is the simple pendulum, an example of
   forced vibrations is the ringing of the electric bell and an example of
   resonance is the vibrating of a bridge when an army is marching across the
   bridge(because the frequencies match.

Posted at: Sun Feb 28 17:12:16 2010 (GMT)

From: haroonamanReply 19 of 54Reply
Subject: Contributed Answer/Explanation to Q. 14
   One example of natural vibrations is the simple pendulum, an example of
   forced vibrations is the ringing of the electric bell and an example of
   resonance is the vibrating of a bridge when an army is marching across the
   bridge(bcause the frequencies match).

Posted at: Sun Feb 28 17:12:51 2010 (GMT)

From: haroonamanReply 20 of 54Reply
Subject: Contributed Answer/Explanation to Q. 15
   One practical use of echoes is the use of echoes in SONAR or Sound
   Navigation And Ranging.

Posted at: Sun Feb 28 17:14:44 2010 (GMT)

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