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a hydrogen atom initially in its ground state absorbs a photon of energy 2.09 x 10^-18 J. The electron rises to some energy level, then falls one level, then falls directly back to the ground state. Calculate the frequencies of every different photon emitted in this process.
there are three masses m1 2.0 kg m2 5.0 kg and m3 7.0 kg. the mass are all affixed to a massless rod of length 15cm.
how much work is done by the electric field as a third charge q3 = +2.19 nC is moved from point a to point b. (q1 = +9.41 nC, q2 = -9.41 nC)
An electron and a proton are each accelerated through a potential dierence of 10.0 MV. Are the particles moving at relativistic speeds
Six mass pieces of 100g each are placed on a mass holder of 140g which is hung from a string. Analyse the tension in the string.
Water moves through a constricted pipe in steady, ideal flow. At the lower point shown in the figure below, the pressure is 1.65 105 Pa and the pipe radius is 2.80 cm. Find the speed of flow in the upper section
A sinusoidal voltage ?v = (65 V) sin (130t) is applied to a series RLC circuit with L = 10 mH, C = 120 ?F, and R = 50 ?. What is the maximum current in the circuit
A cockroach of mass m lies on the rim of a uniform disk of mass 3 m that can rotate freely about its center like a merry-go-round. find the angular velocity of the cockroach-disk system
Springs, having stiffness k, 2k, 4k, 8k, 16k, and so on are tied in series. Find the effective stiffness of the system.
Atennis ball of mass 5.5*10-2and a speed of 39 M/s strikes a wall at a 45 degree angle, what is the direction of of the balls impuse in relation to the wall
A 24 GeV proton in cosmic radiation moves in Earth's magnetic field B, with a velocity v perpendicular to B, What is the radius of the proton's curved path in that region
An object is placed 64.5 cm from a screen. Find the magnification of the lens
A skier approaches the base of an icy, frictionless hill with a speed of 14.4m/s. Find the acceleration of this skier when she is going up the hill
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