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Q. If an object isn't moving, no external force acts on it.
No it is always not true, there would be balanced forces which cancel each other out leaving no net force. Example: Sitting on a chair, the chair pushes up on you while gravity pulls you down, but you aren't going anywhere because those forces cancel each oyher and net force is equal to zero.
Laws of Refraction: There are two laws of refraction. The incident ray, the refracted ray and the normal to the surface of the point of incidence all lie at the similar plan
In laboratory frame of reference, particle A moves along X direction with velocity 0.5 c and particle B moves along Y direction with velocity 0.4 c. Evaluate velocity of particle B
derive an expression for the variation of g with altitude or depth
It is described by de-Broglie a moving material molecule sometimes acts as a wave and sometimes as a particle. The wave associated with moving particle is known as matter w
The percentage of carbon in mild steel is (A) 0.08 to 0.3 % (B) 0.5 to 1.4 % (C) 2.35 % (D) 0.5 % Ans: The percentage of carbon in mild st
brewesters law
why specific heat is different at different temperature?
operation symmetry
example problms of vectors?
Mach number is the ratio of velocity of source to the velocity of sound. Mach Number = Velocity of Source / Velocity of Sound .
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