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1) the positronium atom consists of an electron positron pair bound by their Coluomb potential
a) find the energy of the ground state and caluclate the averge distince between the electron and the position in the ground state
b) if the view the particales as moving in a classical circular orbit what is the radius of the orbit?
Water flowing in a horizontal pipe is at a pressure of 1.55 105 Pa at a point where its cross-sectional area is 6.00 m2. Find the water's speed in the wider pipe
acA block lies on a plane which is inclined at 22 deg to thehorizontal. The coefficient of kinetic friction between blockand plane is %u03BCk = 0.17. compute the acceleration of the block
The pulley in the illustration is a uniform disk of mass 2.8 kg and radius 0.24 m, which is free to rotate without friction. What is the acceleration of the falling block
A solenoid is wound with 970 turns on a foam core 4.0 cm in diameter and 50 cm long. Calculate the induced emf that this coil produces
A source in vacuum emits electromagnetic radiation in every direction. Calculate the frequency and wavelength of this wave
A 3.10 kg steel ball strikes a wall with a speed of 10 m/s at an angle of 60 ° with the surface. It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.190 s, what is the average force exerted on the ball by th..
John can hit a golf ball 310m on earth. on the moon's surface, g=1/6 gravity of earth, so how far could he hit the same ball if he could only achieve half an initial velocity achieved on earth.
The basic concepts in optics.
A large punch bowl holds 3.00kg of lemonade (which is essentially water) at 25.0C. A 5.80×10^?2kg- ice cube at -10.0C is placed in the lemonade a)What is the final temperature of the system? Ignore any heat exchange with the bowl or the surroundin..
A bunch of grapes is placed in a spring scale at a supermarket. The grapes oscillate up and down with a period of 0.64s, What is the mass of the grapes
Consider an optical gain medium that has two levels at E 1=1.50 eV and E 2=3.50 eV. What is the spontaneous emission wavelength
A hole in an iron plate has a radius of 2.300 cm at STP. When the plate is heated to 100 C, what is the hole diameter
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