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[Ended]Physics Tutoring Session on Heat Energy @ 4-5PM Today (Thur 25th Feb. 2016)
Physics
Chima Sunday (Tutor)
25-02-2016 13:55:00 +0000Good day all,
The concept of Heat Energy is the most fundamental in Thermal Physics, often tested in JAMB and other exams. so lets take a quick look into this topics. Welcome and enjoy your time.
Heat Energy is a form of energy which flows due to temperature gradient. Heat makes us feel a sensation of hotness. Heat produced by the sun is called solar heat. Heat is used in many area of life, to mention but a few are cooking, drying, separating of metals from its ores etc. In this lecture we are going to review on the
a) Thermal expansions in Solids
-----Linear expansivity (α) = δL/(Loδθ)
δL = change in length
Lo = original length
δθ = change in temperature
-----Area Expansivity (β) = δA/(Aoδθ)
δA = change in area
Ao = original area
δθ = change in temperature
-----Cubic Expansivity (γ) = δV/(Voδθ)
δV = change in volume
Vo = original volume
δθ = change in temperature
Note that it can be shown that 3α = γ and 2α = β
b) Expansion of Liquid
-----Apparent Volume Expansivity
-----Real Volume Expansivity
c) Heat Transfer
d) Anomalous Expansion of Water.
Sit tight and enjoy your time, and please do come with your questions and writing materials. Once again WELCOME!
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Survey Feedback Link - http://goo.gl/forms/Tasr40Ck1Z This section is over
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El-giver Simon
A satellite moves in a circular orbit of radius 4R round the earth. The acceleration of the satellite in terms of g is
1 25-02-2016 14:08:00 +0000
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JAMES SIRGENTLE
plssss help. me on heat, capacity, .fusion. fission. electricity dissipated. efficiency. potential,, difference
1 25-02-2016 14:20:00 +0000
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Chima Sunday (Tutor)
Hello everybody! welcome once again to our today's tutorial section. Do not forget to ask your questions and contribute when necessary. I still remain my humble self, your one and only ..............? if Gat the answer one kposa for you. So lets kick start.
1 25-02-2016 15:08:00 +0000
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Chima Sunday (Tutor)
@ El-giver Simon. recall that when a body is circling around the earth its centripetal force = gravitational force of attraction so mv^2/r = GMm/r^2. cancelling small m gives you v^2/r = GM/r^2. observe that the left hand side of this equation is the centripetal acceleration a = GM/r^2, but r = 4R, therefor a = GM/(4R) ^2, This gives a = GM/16R^2 recall that mg = GMm/R^2, Then g = GM/R^2, Hence substuting g to obtain, a = g/16. Does that make sense?
1 25-02-2016 15:19:00 +0000
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