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## Discussion topic: Contributed Answer/Explanation to Q. 4

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 Page 1 of 2  > From: mjh_syed Reply 1 of 21 Reply Subject: Contributed Answer/Explanation to Q. 4 ``` Newton ```Posted at: Mon Feb 8 09:34:14 2010 (GMT) From: ratchet Reply 2 of 21 Reply Subject: Contributed Answer/Explanation to Q. 2 ``` According to the principle of conservation of energy energy can neither be created nor be destroyed but changes from one form to another form ```Posted at: Sun Feb 14 02:44:29 2010 (GMT) From: priyanka_naik Reply 3 of 21 Reply Subject: Contributed Answer/Explanation to Q. 4 ``` kg m/s ```Posted at: Sun Mar 7 14:12:05 2010 (GMT) From: priyanka_naik Reply 4 of 21 Reply Subject: Contributed Answer/Explanation to Q. 20 ``` work is said to be done only when a force applied on a body makes a body move ```Posted at: Sun Mar 7 14:13:28 2010 (GMT) From: sumit1007 Reply 5 of 21 Reply Subject: Contributed Answer/Explanation to Q. 28 ``` specific heat of a substance may be defined as the ammount of heat required to raise the temperature of unit mass of a substance through unit degree.its s.i unit is J/gm/degree centigrade if mass=1,temperature=1 then from equation Q=m*c*t or Q=c*1*1 or Q=c or c=Q/mass * temperature ```Posted at: Fri Mar 19 08:05:22 2010 (GMT) From: aaaa123 Reply 6 of 21 Reply Subject: Contributed Answer/Explanation to Q. 22 ``` the amount of work done is known as energy ```Posted at: Sun Mar 28 06:37:43 2010 (GMT) From: amishajaha Reply 7 of 21 Reply View replies (1) Subject: Contributed Answer/Explanation to Q. 13 ``` 4.86 ```Posted at: Tue May 11 06:12:07 2010 (GMT) From: amishajaha Reply 8 of 21 Reply Subject: Contributed Answer/Explanation to Q. 13 ``` 4.86 s ```Posted at: Tue May 11 06:12:48 2010 (GMT) From: harsimran Reply 9 of 21 Reply View replies (1) Subject: Contributed Answer/Explanation to Q. 4 ``` kg m s-1 ```Posted at: Mon Sep 27 14:12:47 2010 (GMT) From: harsimran Reply 10 of 21 Reply Subject: Contributed Answer/Explanation to Q. 4 ``` it is- kg m s-1 ```Posted at: Mon Sep 27 14:13:44 2010 (GMT) From: harsimran Reply 11 of 21 Reply Subject: Contributed Answer/Explanation to Q. 7 ``` angle of incidence at AB is 0 and at AC is 30 it is 0 at AB because it is normal to the surface AB and 30 at AC because 180- (90+60)=30 ```Posted at: Mon Sep 27 14:17:09 2010 (GMT) From: harsimran Reply 12 of 21 Reply Subject: Contributed Answer/Explanation to Q. 9 ``` concave lens ```Posted at: Mon Sep 27 14:18:22 2010 (GMT) From: harsimran Reply 13 of 21 Reply Subject: Contributed Answer/Explanation to Q. 13 ``` 4.86 s d=850 m s=350 ms-1 t=? s=2d/t t=2d/s  =850 x 2/350  =4.86 s ```Posted at: Mon Sep 27 14:24:50 2010 (GMT) From: harsimran Reply 14 of 21 Reply Subject: Contributed Answer/Explanation to Q. 16 ``` advantages of electromagnet over a bar magnet are- 1.Its magnitude can be changed. 2.Its polarities can be changed. ```Posted at: Mon Sep 27 14:26:36 2010 (GMT) From: harsimran Reply 15 of 21 Reply Subject: Contributed Answer/Explanation to Q. 25 ``` pressure ```Posted at: Mon Sep 27 14:27:55 2010 (GMT) From: harsimran Reply 16 of 21 Reply Subject: Contributed Answer/Explanation to Q. 32 ``` because mirror absorb some potion of light where as the prism does not absorb any light and reflects the light with the full intensity ```Posted at: Mon Sep 27 14:31:59 2010 (GMT) From: harsimran Reply 17 of 21 Reply Subject: Contributed Answer/Explanation to Q. 33 ``` gamma rays, x rays, ultra violet rays, infra red rays ```Posted at: Mon Sep 27 14:33:57 2010 (GMT) From: harsimran Reply 18 of 21 Reply Subject: Contributed Answer/Explanation to Q. 37 ``` resonance ```Posted at: Mon Sep 27 14:34:30 2010 (GMT) From: harsimran Reply 19 of 21 Reply Subject: Contributed Answer/Explanation to Q. 39 ``` forced vibrations ```Posted at: Mon Sep 27 14:35:04 2010 (GMT) From: harsimran Reply 20 of 21 Reply Subject: Contributed Answer/Explanation to Q. 40 ``` its pitch increases ```Posted at: Mon Sep 27 14:36:42 2010 (GMT) Page 1 of 2  >