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| From: akhilesh | Reply 121 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 1 |
lever of second order has MA greater than 1. By increasing the effort arm.
By increasing the effort armor moving the fulcrum towards the load
mechanical advantage can be increased.
Posted at: Sun Mar 7 14:02:46 2010 (GMT)
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| From: akhilesh | Reply 122 of 141 | Reply | |
| Subject: spelling check |
check spelling of effort Posted at: Sun Mar 7 14:07:45 2010 (GMT)
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| From: akhilesh | Reply 123 of 141 | Reply | |
| Subject: check 2nd part |
its the fulcrum moved towards the load and not the load towards the fulcrum Posted at: Sun Mar 7 14:10:01 2010 (GMT)
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| From: akhilesh | Reply 124 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 2 |
2:3
<p>
PE = mgh.
</p>
<p>
1st case:- mgh=mg20..........(1)
</p>
<p>
2nd case:- mgh=mg30..........(2)
</p>
<p>
dividing (1) & (2)
</p>
<p>
mg20/mg30
</p>
<p>
Ans: 2:3
</p>
Posted at: Sun Mar 7 14:16:35 2010 (GMT)
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| From: akhilesh | Reply 125 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 4 |
answer:-
Because they are least scattered by fog and they have larger wavelength so
they penetrate fog without getting scattered.
Posted at: Sun Mar 7 14:23:20 2010 (GMT)
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| From: snehald27 | Reply 126 of 141 | Reply | |
| Subject: explanation |
explanation is also needed...
how can u just copy another person's answer? Posted at: Sun Mar 21 06:45:54 2010 (GMT)
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| From: snehald27 | Reply 127 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 25 |
1 kWh is the work done by a source of power 1kW in 1h....
Posted at: Sun Mar 21 06:49:47 2010 (GMT)
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| From: shafeek47 | Reply 128 of 141 | Reply | View replies (1)
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| Subject: Contributed Answer/Explanation to Q. 41 |
v =f lamda
Posted at: Mon May 10 06:58:35 2010 (GMT)
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| From: shafeek47 | Reply 129 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 41 |
v =f lamda
Posted at: Mon May 10 06:58:54 2010 (GMT)
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| From: binayaktarai | Reply 130 of 141 | Reply | View replies (1)
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| Subject: Contributed Answer/Explanation to Q. 3 |
S.I. unit of upthrusts is Newton (N) or kgf. one factor on which upthrust
of a liquid depends is the density of liquid in which the body is submerged
I have been under the teaching of my brother Biplav Tarai from class iv
till now.
Posted at: Wed Jun 9 17:16:55 2010 (GMT)
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| From: binayaktarai | Reply 131 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 3 |
S.I. unit of upthrusts is Newton (N) or kgf. one factor on which upthrust
of a liquid depends is the density of liquid in which the body is submerged
Posted at: Wed Jun 9 17:23:12 2010 (GMT)
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| From: yash_pachchigar | Reply 132 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 8 |
black
Posted at: Mon Nov 15 01:09:00 2010 (GMT)
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| From: shikharsingh | Reply 133 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 33 |
answer is given below.
When we fill Hydrogen gas in a ballon,then it rises because hydrogen is
physically lighter than air. Near the earth surface most of the heavier
gases are present.When ballon rises and it reaches at some height where its
density is equal to the density of air outside the ballon it stops
rising.
Posted at: Sun Nov 21 09:21:14 2010 (GMT)
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| From: ezhilmathi | Reply 134 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 21 |
the ans is:
Hot water
:
Cold water :
mass = m
,
mass = 3m,
change in temperature = t
,
change in temperature = 20-10 =>10
specific latent heat of water = 4200J
. specific latent heat of water =
4200J.
HEAT LOST BY A HOT BODY = HEAT GAINED BY A COLD BODY
m x t x 4200 = 3m x 10 x 4200 ( in this step
4200 on both the sides of equation
vil cancel each other)
m x t = 3m x 10
m x t = 30m
t = 30m / m ( here m vil b canceled)
therefore t = 30 degrees.
Posted at: Mon Dec 20 12:00:52 2010 (GMT)
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| From: gud1 | Reply 135 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 22 |
10 ohms resistor in parallel to 15 ohm resistor
1/x + 1/15 = 1/6x+15/15x = 1/66x + 90 = 15x90 = 9xx = 10 ohms Posted at: Sun Jan 2 20:55:24 2011 (GMT)
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| From: jam31 | Reply 136 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 1 |
class 2
Posted at: Wed Jan 5 12:32:43 2011 (GMT)
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| From: jam31 | Reply 137 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 1 |
class 2
Posted at: Wed Jan 5 12:33:00 2011 (GMT)
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| From: jam31 | Reply 138 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 1 |
class 2
by incresing the length of the effort arm
Posted at: Wed Jan 5 12:33:23 2011 (GMT)
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| From: harshaktg | Reply 139 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 5 |
GIVEN BELOW.. :P ;P
not in 2011 syllabus!! :P
Posted at: Wed Jan 5 14:34:14 2011 (GMT)
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| From: dheerajtabla | Reply 140 of 141 | Reply | View replies (1)
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| Subject: Contributed Answer/Explanation to Q. 8 |
Its not Black. Its BLUE. It will also show blue in Magenta light
Posted at: Sat Jan 15 07:05:47 2011 (GMT)
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