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| From: nikhilesh94 | Reply 21 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 6 |
the elbow is the fulcrum, the hand is the load and the portion between them
is the effort
Posted at: Sat Dec 26 13:18:55 2009 (GMT)
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| From: nikhilesh94 | Reply 22 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 12 |
primary colours are the original colours.all other colours are obtained from
these primary colours.the primary colours are red,blue and green
Posted at: Sat Dec 26 13:21:49 2009 (GMT)
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| From: nikhilesh94 | Reply 23 of 310 | Reply | View replies (2)
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| Subject: Contributed Answer/Explanation to Q. 22 |
radioactivity is a nuclear phenomenon.It is the spontaneous emmision of
particles from the nucleus of an atom to attain stability
Posted at: Sat Dec 26 13:24:53 2009 (GMT)
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| From: nikhilesh94 | Reply 24 of 310 | Reply | View replies (1)
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| Subject: Contributed Answer/Explanation to Q. 22 |
radioactivity is a nuclear phenomenon.It is the spontaneous emmision of
alpha,beta orgamma particles from the nucleus of an atom to attain stability
Posted at: Sat Dec 26 13:25:19 2009 (GMT)
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| From: nikhilesh94 | Reply 25 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 22 |
radioactivity is a nuclear phenomenon.It is the spontaneous emmision of
alpha,beta or gamma particles from the nucleus of an atom to attain
stability
Posted at: Sat Dec 26 13:25:36 2009 (GMT)
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| From: nikhilesh94 | Reply 26 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 23 |
nuclear energy is from only the nucleus of an atom while chemical energy
usually involves electrons. nuclear energy also has much more energy
transformations than chemical energy
Posted at: Sat Dec 26 13:27:18 2009 (GMT)
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| From: nikhilesh94 | Reply 27 of 310 | Reply | View replies (3)
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| Subject: Contributed Answer/Explanation to Q. 25 |
according to the law of conservation of energy, energy can neither be
created nor destroyed, it can only be converted from one form to
another.therefore the mechanical energy is conserved throughout
Posted at: Sat Dec 26 13:29:13 2009 (GMT)
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| From: nikhilesh94 | Reply 28 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 25 |
according to the law of conservation of energy, energy can neither be
created nor destroyed, it can only be converted from one form to
another.therefore the mechanical energy is conserved throughout and is 12.8J
energy is conserved. so the total kinetic energy and potential energy(total
mechanical energy) in a body is conserved.therefore the total energy will be
same in the whole stone's trajectory.only the potential energy and kinetic
energy will vary
Posted at: Sat Dec 26 13:32:19 2009 (GMT)
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| From: nikhilesh94 | Reply 29 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 25 |
according to the law of conservation of energy, energy can neither be
created nor destroyed, it can only be converted from one form to
another.therefore the mechanical energy is conserved throughout and is 12.8J
energy is conserved. so the total of kinetic energy and potential
energy(total mechanical energy) in a body is conserved.therefore the total
energy will be same in the whole stone's trajectory.only the potential
energy and kinetic energy will vary.their sum will remain the same
Posted at: Sat Dec 26 13:33:03 2009 (GMT)
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| From: nikhilesh94 | Reply 30 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 25 |
according to the law of conservation of energy, energy can neither be
created nor destroyed, it can only be converted from one form to
another.therefore the mechanical energy is conserved throughout and is 12.8J
energy is conserved. so the total of kinetic energy and potential
energy(total mechanical energy) in a body is conserved.therefore the total
energy will be same in the whole stone's trajectory.only the potential
energy and kinetic energy will vary.their sum will remain the same
Posted at: Sat Dec 26 13:33:20 2009 (GMT)
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| From: nikhilesh94 | Reply 31 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 26 |
one joule of work is said to be done if a force of one newton displaces a
body through one metre in its own direction.
the C.G.S unit of work is erg.
1 J=107erg.
Posted at: Sat Dec 26 13:35:44 2009 (GMT)
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| From: nikhilesh94 | Reply 32 of 310 | Reply | View replies (1)
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| Subject: Contributed Answer/Explanation to Q. 31 |
see below
refractive index=i/cosec of the critical angle
Posted at: Sat Dec 26 13:37:05 2009 (GMT)
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| From: nikhilesh94 | Reply 33 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 31 |
see below
refractive index=cosec of the critical angle
Posted at: Sat Dec 26 13:37:23 2009 (GMT)
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| From: nikhilesh94 | Reply 34 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 33 |
angle of incidence=angle of emergence
Posted at: Sat Dec 26 13:37:56 2009 (GMT)
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| From: nikhilesh94 | Reply 35 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 34 |
the reflection of sound from a rigid surface(a hillside,a cliff,e.t.c) is
called an echo
Posted at: Sat Dec 26 13:38:50 2009 (GMT)
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| From: nikhilesh94 | Reply 36 of 310 | Reply | View replies (1)
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| Subject: Contributed Answer/Explanation to Q. 35 |
it is used in a sonar used for detection of the depth of the sea in
particular places
Posted at: Sat Dec 26 13:39:38 2009 (GMT)
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| From: nikhilesh94 | Reply 37 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 35 |
it is used in a sonar used for detection of the depth of the sea in
particular places
Posted at: Sat Dec 26 13:39:59 2009 (GMT)
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| From: nikhilesh94 | Reply 38 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 36 |
it is called a solenoid
Posted at: Sat Dec 26 13:40:18 2009 (GMT)
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| From: nikhilesh94 | Reply 39 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 37 |
an electromagnet
Posted at: Sat Dec 26 13:40:40 2009 (GMT)
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| From: nikhilesh94 | Reply 40 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 39 |
this is due to resonance
resonance is a special case of forced vibrations where the frequency of an
external source matches the natural frequency of a body. the body then
absorbs all the vibrations falling on it more readily and vibrates with a
larger amplitude
Posted at: Sat Dec 26 13:42:35 2009 (GMT)
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