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From: rajeev400004Reply 1 of 310Reply
Subject: Contributed Answer/Explanation to Q. 21
   it is minimum energy  required by surface electron to loose

Posted at: Tue Nov 24 16:07:36 2009 (GMT)

From: djnineReply 2 of 310Reply
Subject: Contributed Answer/Explanation to Q. 1
   kgms-1

Posted at: Wed Nov 25 09:43:05 2009 (GMT)

From: djnineReply 3 of 310Reply
Subject: Contributed Answer/Explanation to Q. 2
   newton

Posted at: Wed Nov 25 09:43:41 2009 (GMT)

From: djnineReply 4 of 310Reply
Subject: Contributed Answer/Explanation to Q. 3
   14.7 N

Posted at: Wed Nov 25 09:49:55 2009 (GMT)

From: metprpReply 5 of 310Reply         View replies (1)
Subject: Contributed Answer/Explanation to Q. 5
   (i) electric energy to heat energy

Posted at: Sat Nov 28 16:41:35 2009 (GMT)

From: metprpReply 6 of 310Reply
Subject: Contributed Answer/Explanation to Q. 5
   (i) electric energy to heat energy	  

Posted at: Sat Nov 28 16:42:13 2009 (GMT)

From: kshitij26Reply 7 of 310Reply
Subject: Contributed Answer/Explanation to Q. 18
   the diffierence
   ac generator makes use of two coaxial rings while aa dc motor makes use of
   two parts of a slip ring 

Posted at: Mon Nov 30 11:42:36 2009 (GMT)

From: aananditasharmaReply 8 of 310Reply
Subject: Contributed Answer/Explanation to Q. 35
   sonar

Posted at: Thu Dec 3 06:06:35 2009 (GMT)

From: maheshnathwaniReply 9 of 310Reply
Subject: Contributed Answer/Explanation to Q. 4
   The arrow gets its kinetic energy from the string which is plucked thus
   posessing the potential energy

Posted at: Thu Dec 10 16:07:35 2009 (GMT)

From: maheshnathwaniReply 10 of 310Reply
Subject: Contributed Answer/Explanation to Q. 5
   1)electrical to heat energy	2) sound energy to electrical energy

Posted at: Thu Dec 10 16:09:05 2009 (GMT)

From: 007Reply 11 of 310Reply         View replies (1)
Subject: Contributed Answer/Explanation to Q. 9
   dirrection
   due to heat

Posted at: Fri Dec 11 14:07:48 2009 (GMT)

From: 27539265Reply 12 of 310Reply
Subject: Contributed Answer/Explanation to Q. 7
   velocity of light  in air/velocity of air in glass= 1.5/1.33=1.127

Posted at: Sat Dec 12 14:00:52 2009 (GMT)

From: 27539265Reply 13 of 310Reply         View replies (4)
Subject: Contributed Answer/Explanation to Q. 10
   hey light cannot travel at such a speed, it has max speed of 332m/s that too
   in vaccum conditions

Posted at: Sat Dec 12 14:05:59 2009 (GMT)

From: sudhitaurus80594Reply 14 of 310Reply
Subject: Contributed Answer/Explanation to Q. 10
   actually speaking...the answer, according to my estimation, is 0.0003
   seconds...
   
   we have distance d = 45km = 45000m, velocity of the radar signal = 3 x
   10^8m/s
   
   
   time t is obtained by
   
   
   t = 2d/v = 90000/(30000 * 10000)=3/10000=3/10^4=3*10^-4 = 0.0003seconds...
   
   
    
   
   
   i presume light travels at the speed of 3* 10^8 m/s in vacuum and air...and
   sound travels at 332 m/s...plus, sound does not travel in vacuum for it
   needs a medium for propogation...
   
   
    

Posted at: Thu Dec 17 13:54:51 2009 (GMT)

From: sudhitaurus80594Reply 15 of 310Reply
Subject: Contributed Answer/Explanation to Q. 14
   resistance

Posted at: Thu Dec 17 13:59:26 2009 (GMT)

From: sudhitaurus80594Reply 16 of 310Reply
Subject: Contributed Answer/Explanation to Q. 16
   1)voltage maintained at the terminals of the bulb remains the same and no
   additional voltage is required    2)even if one of the bulb in the
   combination fuses, the other two still works...

Posted at: Thu Dec 17 14:01:40 2009 (GMT)

From: sudhitaurus80594Reply 17 of 310Reply         View replies (1)
Subject: Contributed Answer/Explanation to Q. 17
   answer = Rs. 156 
   
   we have 
   
   
   power = 4kW
   
   
   time = 12 hours 
   
   
   we know that the usual unit used to calculate electrical energy used is
   kilowatt hour
   
   
   hence, 1 kWh = Rs. 3.25
   
   
   therefore,
   
   
   total cost = total electrical energy used * rate per unit
   
   
   = 4kW * 12hours * 3.25
   
   
   =Rs. 

Posted at: Thu Dec 17 14:09:28 2009 (GMT)

From: sudhitaurus80594Reply 18 of 310Reply
Subject: Contributed Answer/Explanation to Q. 17
   answer = Rs. 156 
   
   we have 
   
   
   power = 4kW 
   
   
   time = 12 hours 
   
   
   we know that the usual unit used to calculate electrical energy used is
   kilowatt hour 
   
   
   hence, 1 kWh = Rs. 3.25 
   
   
   therefore, 
   
   
   total cost = total electrical energy used * rate per unit 
   
   
   = 4kW * 12hours * 3.25 
   
   
   =Rs. 156

Posted at: Thu Dec 17 14:10:03 2009 (GMT)

From: sudhitaurus80594Reply 19 of 310Reply
Subject: Contributed Answer/Explanation to Q. 24
   potential = 12.8 joules
   
   given that
   
   
   mass m = 64g = 0.064 kg
   
   
   initial velocity u = 20m/s
   
   
   final velocity v = 0
   
   
   deceleration due to gravity = g = 10m/s^2
   
   
   deceleration = negative acceleration = -a = -10m/s^2
   
   
   from the relation v^2 = u^2 + 2*a*S
   
   
    0 = 400-2*10*S
   
   
   20*S = 400
   
   
   S = 20m
   
   
   S = height h = 20m
   
   
   potential at the highest point 
   
   
   = mass*gravity*height
   
   
   =0.064*20*10
   
   
   =6.4*2
   
   
   =12.8 joules
   
   
    

Posted at: Thu Dec 17 14:21:04 2009 (GMT)

From: sudhitaurus80594Reply 20 of 310Reply
Subject: Contributed Answer/Explanation to Q. 25
   6.4 joules
   
   at half way point, 
   
   
   height = 0.5 * 20 =10m
   
   
   potential
   
   
   =mass*gravity*height
   
   
   =0.064*10*10
   
   
   =6.4 joules

Posted at: Thu Dec 17 14:26:04 2009 (GMT)

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