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Q. Jingdan turned a screwdriver into a magnet by rubbing it with a strong bar magnet to pick up a screw that has fallen into an inaccessible spot.
How could he demagnetize his screwdriver after picking up the screw?
He could drop it, heat it, hit it with a hammer, or somehow otherwise jiggle the magnetic domains into randomness.
Little Fish in Motion is Caught by Big Fish The animation below portrays the inelastic collision among a extremely massive fish and a less massive fish. Before the collision, t
Question: What all are able to the power P possibly represent in the expression P = IV where I is current and V is voltage? Answer: The small definition for power is th
if a big person and a small person run up the stairs in the same time, which of them develops the most power
Compared with an atom of atomic weight 12 and atomic number 6, the atom of atomic weight 13 and atomic number 6: (1) Contains more neutrons (2) Contains more electro
An ice-skater with a mass of 75.0 kg pushes off against a second skater with a mass of 42.0 kg. Both skaters are initially at rest. After the push, the larger skater moves
Sound waves are being used to determine the depth of a freshwater lake, as shown in the figure below. If the water is 25°C and it takes 1.2 s for the echo to return to the sens
Q. Two wires of same material and same length have resistances 5 and 10 respectively. Find the ratio of radii of the two wires. R = ρl / A = ρl / πr 2 R 1 = ρl / A = ρl
define unlike parallel forces with example
Constancy principle (A. Einstein): One of the postulates of A. Einstein's special theory of relativity, that puts forth that the speed of light in vacuum is calculated as the
Consider an x-ray tube in which electrons are accelerated by a constant high voltage of 250 kV. If the electron beam current is 10 mA, calculate the x-ray energy flux (energy fluen
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