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A line in the x-ray spectrum of gold has a wavelength of 18.5 pm(=18.5x10^12 m) The emitted x-ray photons corresponds to a transition of the gold atom between two stationary states, the upper one of which has the energy -13.7 keV. What is the energy of the lower stationary state?
An organ pipe is 1.42 m long. What is the first harmonic frequency of this pipe when it is open at both ends
A solenoid 88.0 cm long has a radius of 2.60 cm and a winding of 2000 turns; it carries a current of 3.60 A. Calculate the magnetic field outside the solenoid
The first car has twice the mass of a second car, but only half as much kinetic energy. What were the original speeds of the two cars
Consider a single electron, with a mass of 9.1×10?31 , subject to a single force equal to the weight of a penny, What is the acceleration of the electron
A box is pushed a distance d along a ramp at a constant speed by a horizontal force, Fa. how much work is done by the horizontal force
A box is dropped from a spacecraft moving horizontally at 27.0 m/s at a distance of 155 m above the surface of a moon. The rate of freefall acceleration on this airless moon is 2.79 m/s2.
A rocket blasts off vertically from rest on the launch pad with an upward acceleration of 2.30. At 10.0 after blastoff, the engines suddenly fail, which means that force they produce instantly stops.
The ramp is slanted at an angle of 17.0 degrees to the horizontal. Illustrate what is the coefficient of kinetic friction between the block and the ramp?
The resistance of a copper wire of length L meter is 0.1 ohms. If the diameter of the wire is 0.045cm, find out its specific resistance.
q1. a certain metal with atomic mass 2.6 times 10-25kg has an interatomic bond with length 1.7 times 10-10 m and
A load of 52.5 N attached to a spring hanging vertically stretches the spring 5.29 cm. What force is required to stretch the spring by this amount
A face appears in a convex mirror; face is 75% its normal size and appears to be 24cm behind the mirror. How far was the face standing from the mirror
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