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Two trains on separate tracks move toward one another. Train 1has a speed of 140 km/h, train 2 speed of 55.0 km/h. Train 2 blows it shorn, emitting a frequency of 500 Hz. What is the frequency heard by the engineer on train 1? (Assume the speed of sound is 345m/s.)
Explain about the term intrinsic sensors. Intrinsic sensors: Optical fibers can be utilized as sensors to measure temperature, strain, pressure and other quantities by chang
The conductivity of an extrinsic semiconductor (A) Decreases with temperature. (B) Increases with temperature. (C) Remains constant with temperature. (D) Decrea
In Bohr's theory of the atom, what force was responsible for holding the electrons in their orbit? Ans: Coulomb force or the force of attraction among the proton (nucleus) a
Three capacitors with different capacitances are connected in series. Which of the following statements is TRUE? a) All three of the capacitors have the same potential diffe
Q. Explain the Law of Machines? Answer:- Machines which are utilized to lift a load are governed by the Law of machines which states that the effort to be applied on the m
Defects of vision and their correction There is a simple relationship between the focal length F ,the object distance P and the image distance Q of a thin lens fig(1).
Ferromagnetic Substance: A substance which behaves as a magnet in presence of a strong magnetic field is known as ferromagnetic substance. E.g. Iron, Nickel
photo electric cells, types ,how they work
When a radar gun says the pitch is 90 miles per hour at what point in the balls travel to home plate is the radar gun measuring the velocity? The measurement is made at the po
The weightless truss shown below supports loads at point A & B and is fastened to the supports at C & E. The value of F1 in kN is given in P13 and the value of F2 in kN is given i
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