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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 +0000

Good 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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This section is over

• 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

• JAMES SIRGENTLE

plssss help. me on heat, capacity, .fusion. fission. electricity dissipated. efficiency. potential,, difference

1 25-02-2016 14:20:00 +0000

• JAMES SIRGENTLE

heat capacity

1 25-02-2016 14:20:00 +0000

ok

1 25-02-2016 15:04:00 +0000

• Ofoegbu Deborah1995

Plsss tutor define enthalpy change

1 25-02-2016 15:06:00 +0000

• 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

• Ofoegbu Deborah1995

Plsss tutor define enthalpy change

1 25-02-2016 15:09:00 +0000

• Ugwuanyi Chukwuebuka

alright

1 25-02-2016 15:10:00 +0000

• cordelia ekpenyong

nice

1 25-02-2016 15:11:00 +0000

• 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