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| From: rajeev400004 | Reply 1 of 310 | Reply | |
| 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)
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| From: djnine | Reply 2 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 1 |
kgms-1
Posted at: Wed Nov 25 09:43:05 2009 (GMT)
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| From: djnine | Reply 3 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 2 |
newton
Posted at: Wed Nov 25 09:43:41 2009 (GMT)
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| From: djnine | Reply 4 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 3 |
14.7 N
Posted at: Wed Nov 25 09:49:55 2009 (GMT)
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| From: metprp | Reply 5 of 310 | Reply | View replies (1)
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| Subject: Contributed Answer/Explanation to Q. 5 |
(i) electric energy to heat energy
Posted at: Sat Nov 28 16:41:35 2009 (GMT)
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| From: metprp | Reply 6 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 5 |
(i) electric energy to heat energy
Posted at: Sat Nov 28 16:42:13 2009 (GMT)
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| From: kshitij26 | Reply 7 of 310 | Reply | |
| 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)
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| From: aananditasharma | Reply 8 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 35 |
sonar
Posted at: Thu Dec 3 06:06:35 2009 (GMT)
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| From: maheshnathwani | Reply 9 of 310 | Reply | |
| 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)
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| From: maheshnathwani | Reply 10 of 310 | Reply | |
| 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)
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| From: 007 | Reply 11 of 310 | Reply | View replies (1)
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| Subject: Contributed Answer/Explanation to Q. 9 |
dirrection
due to heat
Posted at: Fri Dec 11 14:07:48 2009 (GMT)
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| From: 27539265 | Reply 12 of 310 | Reply | |
| 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)
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| From: 27539265 | Reply 13 of 310 | Reply | View replies (4)
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| 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)
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| From: sudhitaurus80594 | Reply 14 of 310 | Reply | |
| 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)
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| From: sudhitaurus80594 | Reply 15 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 14 |
resistance
Posted at: Thu Dec 17 13:59:26 2009 (GMT)
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| From: sudhitaurus80594 | Reply 16 of 310 | Reply | |
| 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)
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| From: sudhitaurus80594 | Reply 17 of 310 | Reply | View replies (1)
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| 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)
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| From: sudhitaurus80594 | Reply 18 of 310 | Reply | |
| 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)
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| From: sudhitaurus80594 | Reply 19 of 310 | Reply | |
| 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)
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| From: sudhitaurus80594 | Reply 20 of 310 | Reply | |
| 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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