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Inertia: the resistance an object has to a alter in its state of motion.
Newton's first law of motion declares that force is NOT required to keep an object in motion.
Slide a book across the table and watch it slide to a rest position. The book in motion on the tabletop does not come to a rest position due to the absence of a force; rather it is the presence of a force - the force of friction - that brings the book to a rest position.
Three coils each having resistance 3 Ω and inductive reactance 4Ω are linked (i) instar and (ii) in delta to a 415V, 3-phase supply. Calculate for each connection (a)
Cannon of mass 5m (having a shell of mass m) is at rest on a smooth horizontal ground fires the shell with its barrel at an angle A with the horizontal at a velocity u relative to
Q. Why X-rays are not used in microscopes? 1) The wavelength of X-rays is slighter than that of the visible light. 2) X-rays can't be focussed as visible radiations are foc
Explain electrical conductivity of a conductor and give its S.I. unit. Write S.I. unit of magnetic flux. Is it a vector or a scalar quantity?
Chronology protection conjecture (S.W. Hawking) The concept that the formation of any closed timelike curve will be destroyed automatically trhough quantum fluctuations as soon
The Michelson interferometer was designed to study the nature of: a) water waves b) sound waves c) an "ether" d) sunlight Ans: The Michelson inte
1. How fast must an object travel for its total energy to be (a) 1% more than its rest energy and (b) 99% more than its rest energy. 2. A proton is moving with a constant speed
An infinitely long wire carries a current of three amps. The magnetic field outside the wire: a) Points radially away from the wire b) Points radially inward c) Circ
The magnitude of a charge, q, is to be determined by transferring the charge equally to two pith balls. Each of the pith balls has a mass of m, and is suspended by an insulating th
Who discovered Proton? In 1886 Eugen Goldstein discovered canal rays (also called as anode rays) and showed that they were positively charged particles (ions) formed from gases
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