Let us consider a circle with Radious R meter. and the angle of arc abiut the center of Circle is theta θ.
Then the Arc length is equal to,
= {θ/360}*2πR
by this law we can determine the length of ARC of Circle.
Tuesday, August 2, 2016
Tuesday, December 29, 2015
What is aqueous solution?
An aqueous solution is a solution in which the solvent is water. It is usually shown in chemical equations by appending (aq) to the relevant
chemical formula. For example, a solution of table salt , or sodium chloride (NaCl), in water would be represented as NaCl(aq). The word
aqueous means pertaining to, related to, similar to, or dissolved in water. As water is an excellent solvent and is also naturally abundant, it is a ubiquitous solvent in chemistry .
Thursday, December 10, 2015
যন্ত্রকৌশল সঙ্গীত
---- যন্ত্রকৌশল সঙ্গীত-----
সাইফুল ইসলাম মজুমদার
এম ই ১/২ (B), ডুয়েট
"মোরা উদ্যম, মোরা দুর্দম
মোরা ধাবমান, মোরা অাবহমান।
মোরা যন্ত্রকে করি গতিদান।।"-১
নীল অাকাশের ওই কালো মেঘ কেটে,
উড়ে যায় অগ্রগামী উড়োযান।
মানুষের তরে এই সভ্যতা অাজো অাবহমান...
"যুগের তরী মোরা বয়ে চলি,
কেটে জল কল কল,
বিশ্বের তরে অামাদের যন্ত্র প্রকৌশল।।"-২
................১...........
টারবাইনের পাখায় মোরা শক্তির জয়গান,
বয়লারের বাষ্পে অাজ,
সমাজের রেলগাড়ি চলমান।
ডিজেল ইঞ্জিনের জলন্ত শিখা মোরা,
মোরা দিপ্তিমান।
..................১..............
কৃষকের তরে মোরা বিধাতার দান,
কারখানার চাকা প্রতিনিয়ত ঘুর্নায়মান।
অামরা যত নব প্রযুক্তির ঘামে ভেজা অভিধান,
চল সবাই মিলে গাই নব সৃষ্টির জয়গান।।
................১................
....................২..............
Thursday, October 15, 2015
What is Heat?
Heat is energy transferred between a system and its surroundings as a result of
a temperature difference. Energy that passes from a warmer body (with a higher
temperature) to a colder body (with a lower temperature) is transferred as heat.
At the molecular level, molecules of the warmer body, through collisions, lose
kinetic energy to those of the colder body. Thermal energy is transferred—“heat
flows”—until the average molecular kinetic energies of the two bodies become
the same, until the temperatures become equal. Heat, like work, describes
energy in transit between a system and its surroundings.
Not only can heat transfer cause a change in temperature but, in some
instances, it can also change a state of matter. For example, when a solid is heated,
the molecules, atoms, or ions of the solid move with greater vigor and eventually
break free from their neighbors by overcoming the attractive forces between
them. Energy is required to overcome these attractive forces. During the process
of melting, the temperature remains constant as a thermal energy transfer (heat)
is used to overcome the forces holding the solid together. Aprocess occurring at a
constant temperature is said to be isothermal. Once a solid has melted completely,
any further heat flow will raise the temperature of the resulting liquid.
Although we commonly use expressions like “heat is lost,” “heat is gained,”
“heat flows,” and “the system loses heat to the surroundings,” you should not
take these statements to mean that a system contains heat. It does not. The
energy content of a system, as we shall see in Section 7-5, is a quantity called
the internal energy. Heat is simply a form in which a quantity of energy may be
transferred across a boundary between a system and its surroundings.
It is reasonable to expect that the quantity of heat, q, required to change the
temperature of a substance depends on
• how much the temperature is to be changed
• the quantity of substance
• the nature of the substance (type of atoms or molecules)
Collected by, shaiful islam majumder
Mechanical engineering, 1/2
Dhaka university of Engineering and Technology-DUET
a temperature difference. Energy that passes from a warmer body (with a higher
temperature) to a colder body (with a lower temperature) is transferred as heat.
At the molecular level, molecules of the warmer body, through collisions, lose
kinetic energy to those of the colder body. Thermal energy is transferred—“heat
flows”—until the average molecular kinetic energies of the two bodies become
the same, until the temperatures become equal. Heat, like work, describes
energy in transit between a system and its surroundings.
Not only can heat transfer cause a change in temperature but, in some
instances, it can also change a state of matter. For example, when a solid is heated,
the molecules, atoms, or ions of the solid move with greater vigor and eventually
break free from their neighbors by overcoming the attractive forces between
them. Energy is required to overcome these attractive forces. During the process
of melting, the temperature remains constant as a thermal energy transfer (heat)
is used to overcome the forces holding the solid together. Aprocess occurring at a
constant temperature is said to be isothermal. Once a solid has melted completely,
any further heat flow will raise the temperature of the resulting liquid.
Although we commonly use expressions like “heat is lost,” “heat is gained,”
“heat flows,” and “the system loses heat to the surroundings,” you should not
take these statements to mean that a system contains heat. It does not. The
energy content of a system, as we shall see in Section 7-5, is a quantity called
the internal energy. Heat is simply a form in which a quantity of energy may be
transferred across a boundary between a system and its surroundings.
It is reasonable to expect that the quantity of heat, q, required to change the
temperature of a substance depends on
• how much the temperature is to be changed
• the quantity of substance
• the nature of the substance (type of atoms or molecules)
Collected by, shaiful islam majumder
Mechanical engineering, 1/2
Dhaka university of Engineering and Technology-DUET
Wednesday, September 16, 2015
Saturday, August 29, 2015
Equation Of Life
Life is a Complex Equation, where D is A Unknown
variable! (D= Dream)
And x is a Targeted variable. (x=Number of season like,
1=Child, 2= pre Adult 3=young & 4= old)
L=Life
here, Dream is constant
So, Equation of life Life,
L =Limit (Birth→die), x→1/2/3/4
∑ f( 10+x^3)+ D
Saturday, April 11, 2015
Diagram of Iron-Carbon equilibrium
This is an real hand scratch of engg.shaiful islam majumder .
The real iron -carbon equilibrium showd on picture with Eutectic and Eutectoid point include Temperature (selcious).
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