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Force in Two and Three Dimensions - Pressure and Fluids
Pressure is a force exerted over an area and is measured in Pascals (Pa).
P (in Pa) = Force (in newtons) / area (in m2) If a 750 N person were to accidentally step on your foot, would you rather they were wearing a flat soled sneaker or a narrow spike heel when they hit your foot? Obviously the sneaker because the force would be spread over a much larger area and the pressure at any point of your foot would be much less than if the force is concentrated on just a narrow heel. Example - If a person who weighs 750 Newtons makes contact with your foot on a heel which is 0.5 cm x 0.5 cm, what is the pressure exerted on your foot?
compare the electrostatic force between two protons to the gravitational force acting on them?
(i) It is also known as impure semiconductor. (ii) The phenomena of adding impurity is known as Doping.
How could you predict the spontaneity of a chemical reaction, given changes in entropy and enthalpy?
Two concentric conducting shells a and b are of radii R and 2R. A charge +q is centred at their center. Shell b is then earthed and a is given charge q. Find the charge on outer su
Q. What is the focal length of a convex lens of focal length 30 cm in contact with a Concave lens of focal length 20 cm ? Is the system a converging or a diverging lens? Ignore
MANUFACTURING: Two processes are used manufacturing. Coated film: A mixture of carbon, filler and binder is coated on a ring of insulating material. The surface of the film is
blackbody radiation The radiation the radiance at specific frequencies all across the spectrum generated by a blackbody i.e., a perfect radiator (and absorber) of heat. Physic
Q. What are uses of ultra-violet radiations? Uses of ultra-violet radiations: (i) They are utilized to destroy the bacteria and for sterilizing surgical instruments.
Role of Magnetic field in generating ultrasonic waves Magnetic field is applied parallel to the length of a ferromagnetic rod made of material as like iron or nickel, a small e
Mines Flame proof squirrel cage induction motors are used in coal mine.
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