PHYSICS

Resonance and forced Vibration in physics

Force Vibration and Resonance Let talk about force vibration before we discuss resonance.  From observation the amplitude of vibration in simple harmonic motion never really remains constant but becomes smaller and smaller. For instance the amplitude of bob of a simple pendulum decrease slowly until it comes to a stop. This is caused by loss …

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Simple harmonic motion in physics

what is simple harmonic motion? If a small body or a particle vibrates or moves to and fro along a straight line under the influence of a force so that its acceleration  toward a fixed point (or it equilibrium position) is proportional to its distance or displacement from that point, the body is said to …

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General physics question and answer 

  general physics questions and answer  1-10 The system international unit of pressure is Nm-2 or what? Answer: Pascal Define pressure. Answer: Pressure is defined as the force per unit area State the Pascal’s principle Answer: The Pascal’s principle states that the pressure applied to an enclosed fluid is       transmitted  undiminished to every …

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Radioactive elements

Radioactive elements and radioactivity

What is radioactivity? This is the spontaneous decay or disintegration of unstable nuclei of atoms of radioactive elements  by the emission of alpha (α-) particle, beta (β-) particle and gamma (γ-) radiation with the production of energy. What are radioactive elements?  These are the unstable elements that can decay or disintegrate  spontaneously to emit alpha …

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Physics formulas

Physics formulas, book 0ne for beginner

Physics Formulas for motions For the equation that connect, speed, velocity, acceleration, distance and time, we have four as listed below. V=U+2aS Physics formulas for work done W=Mgh (work done when something fall from up Physics formulas for energy EK=mgh , m=mass, g=gravity h=height Physics formulas for Power Physics formulas for linear expansion of solid …

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Semi conductor

What is semi conductor in physics?

 Semi Conductors These are the material with resistivity between conductors and insulators. That is they are neither conductor nor insulator, therefore they are called Semi conductor. Examples, germanium has resistivity of 0.6×103Ω-m and silicon has resistivity of 1.5×103Ω–m Semi conductors are grouping IV, elements, with four electrons in their outmost shell. The valence electrons of …

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Fundamentals of Physics

Fundamentals of Physics questions and answers

Fundamentals of Physics questions and answers 1-10 Why is it that when you match a rug in your room you feel worn but when you match on the floor which is in the same room temperature with the rug you feel cold? Answer: It is because the cement floor is a good conductor of heat, …

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Projectile motion

Projectile motion in physics, what is it?

What is Projectile motion in physics   Projectile is an object thrown into air or launched in space to move freely by itself under the influence of gravity and air resistance. In projectile  motion we have time of Flight, time to reach maximum height, Maximum height and Range, all these are the parameters we take …

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quasar

Quasar-quasi stellar object facts (brightest object )

What is Quasar Quasar also known as QSO Quasi-Stellar object is   an extremely luminous active galactic nucleus Quasars are the furthest object from galaxy that can be seen Quasars are the brightest object in the universe Quasars are  believed to be a supermassive black hole rounded by an accretion disk. Quasar is about two billion …

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black hole facts

black hole facts you may not know (over 30)

These are the the black hole facts you may not know 1. Black hole is a place in space where gravity pull so much that it can trap light 2. In black hole matter are being squeezed in tiny space hence the strong gravity 3. Nobody can see black hole because no light can get …

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Electromagnetic wave examples, definition

Electromagnetic Wave These are the types of waves that do not need material medium for their propagation. They are produced by electromagnetic vibration. All the electromagnetic wave have the velocity of about 3 x 108m/s , but they defers in their wave length and in their frequency too. Therefore electromagnetic waves can be distinguished by …

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Physics question and answer on wave

Physics question and answer on wave 1 What is wave? Answer: Wave is  a disturbance which travels through a medium, transferring energy from one point to another, without permanently displacing the medium. Read also :  Electromagnetic wave examples and uses Physics question and answer on wave 2 What is the difference between Mechanical wave and …

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What is force in physics ?

What is force? Force can be defined as  agent that causes a body to change its state of rest or make it change its state and direction of its uniform motion when it  come in contact with the body. It can also be describe as external agent when applied to a body changes its state …

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What is friction in physics?

What is friction? Friction can be defined as a force which act at the surface of separation of two bodies in contact, and tend to oppose the motion of one over the other. Or The force resisting the relative motion of solid surface, fluid layers or object sliding against each other Frictional Force The  frictional …

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Physics question and answer on motion

Physics question and answer on motion 1 A car moves from rest with an acceleration of 0.2m/s2. Find the velocity when it has moved a distance of 50m. Answer V2 + u2 = 2aS Where v = ?, u = 0 (because the car started from rest) a = 0.2m/s2, and  = 50m V2  + …

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Physics: questions and answers on momentum and gravity

questions  on momentum and gravity 1 t0 5 Momentum and gravity: Give the direction and magnitude of the net force acting on the followings (1)  drop of rain falling down with a constant speed (2) A cork of mass 10g floating on water (3)) A kite held stationary on the sky (4) A can moving …

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how to read Vernier caliper

Vernier caliper is an instrument use in measurement. We use vernier caliper to measure small length such as diameter of rod ,  internal diameter of a tube  the depth of a cavity or the thickness of a plate, that which cannot be measured accurately  by  meter rule.  parts of the Vernier caliper. A Vernier caliper …

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Newtons Law of cooling statement

Newtons Law of cooling Newtons law of cooling state that for small difference in temperature between a body and it surroundings, the rate of gain or loss of heat by the body is proportional to the difference in temperature between the body and the surroundings. The Newtons law of cooling only holds in small range …

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X ray and Compton scattering

X-ray production The x-ray which is an example of electromagnetic, is produced when a rapid moving electron that have been accelerated through a potential difference of 103v to 106v strike a metal target.  The electron are produced by thermionic emission from the heated cathode and accelerated toward the anode (target) by large potential difference between …

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Laws of Conservation of Momentum (physics)

Law of Conservation of Momentum Before we talk about conservation of momentum, let us first of  all  define momentum. Momentum is the products of mass and velocity. For example if a body of mass, M, is moving with velocity v, then the momentum of the body is = m x v. From the Newton’s second …

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