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in a simple model of the hydrogen atom, the electron moves in a circular orbit of radius 0.053 nm around a stationary proton. How many revolutions per second does the electron make?
A ball and bat, approaching one another each with the same speed of 1.1 m/s collide. Find the speed of the ball after the collision. find the factor by which the kinetic energy of the ball increases
n unmarked police car traveling a constant 95 km/h is passed by a speeder traveling 130 km/h. how much time passes before the police car overtake the speeder
You (height of your eyes above the water, 1.75) are standing 2.00 from the edge of a 2.50--deep swimming pool. You notice that you can barely see your cell phone, that went missing a few minutes before, on the bottom of the pool.
Because a concave lens cannot form a real image of a real object, it is difficult to measure its focal length precisely. What is the focal length of the concave lens
A coil has 480 turns and self-inductance 3.40 mH. At t = 0.0150 s, what is the magnitude of the induced emf
A boy coasts down a hill on a sled, reaching a level surface at the bottom with the speed of 8.4 m/s. If the coefficient of friction between sled's runners and snow is 0.040.
Three resistors are connected in parallel to a 12.0 V battery. Two of the resistance values are 58\Omega and 42\Omega. what is the value of the third resistor
An antifreeze solution is made by mixing ethylene glycol (? = 1130 kg/m3) with water. determine the volume percentage of ethylene glycol in the solution
An arrow is launched vertically upward from a crossbow at 97.9 m/s. Ignoring air friction, what is its instantaneous speed at the end of 10.0 s of flight? What is its average speed up to that moment? How high has it risen? What is its instantaneou..
The electric potential in a region is V=-Vo(r/R), Find expressions for the magnitude and direction of the electric field in this region
A loud speaker is playing rock music. Consider the sound from it as a spherical wave. what is the sound intensity level
Robert has just bought a new model rocket, and is trying to measure its flight characteristics. how much work is done by the drag force on the rocket during its ascent
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