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Newton's Law of Gravitation
In 1687, Newton did not "discover" gravity but he did figure out that gravity is universal. It makes a ball fall when you drop it on earth. It also keeps all the planets falling around the sun in their orbits. Any object in the universe pulls all other objects towards it. For example, the sun and the Earth are pulled towards each other by gravity. The size of the force pulling on them depends on their masses and the distance between them. The larger either of the masses get, the larger the force gets. The bigger the distance gets, the smaller the force gets. To calculate the force of attraction in Newtons,
Force = G (m1m2/d2)
where G = 6.67 x 10-11 Nm2/kg2, m1 and m2 are their masses in kilograms, and d is the distance between them in meters.
So why is it that the Earth revolves around the sun and not the other way around? The force on the sun and the Earth are the same, but the sun is much more massive, so the force does not accelerate the sun like it does the Earth. So, the sun stands still and the Earth revolves around it.
The charge and discharge characteristics of lead battery: During discharge the plates are converted into lead sulphate, the water content of the electrolyte increases, the inte
(1) Holes works as virtual charge, although there is no charge on holes. (2) Effectual volume of hole is more than electron. (3) Mobility of hole is fewer than electron.
The current induced in the conductor due change in magnetic field is called eddy current.we study more about this in electro magnetic laws.
Light with a wavelength of 454.5 nm passes by two slits that are 95.2 cm from a screen. The distance among the centers of the central band and the first-order band is 15.2 mm.
Q. When the negative feedback is practical to an amplifier of gain 50 the gain falls to 25. Compute the feedback ratio? Af = A / 1 + Aβ 25 = 50 / 1 + 50 β 1 = 2 / 1 + 50
Describe power of a lens. Write its SI unit. What do you mean by linear magnification produced by a lens in a direction perpendicular to its axis? Write down the mathematical expre
The angular displacement of a body is a function of time and giving by equation h=10+3t+6t square,where t is in seconds.determine the angular velocity, acceleration when t=5seconds
The discharge over a triangular notch can be written as Q = (8/15) Cd (2g)0.5 tan(θ/2) H5/2 If an error of 1% in measuring H is introduced determine the corresponding error
It is the molecular weight of a substance expressed in grams ; the basic unit of amount of substance adopted under the Systeme International d''Unites.
What is the best means of solving a vector problem? By using 2 or 3 Cartesian coordinates?
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