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In the Bohr model of the hydrogen atom, an electron moves in a circular path around a proton. The speed of the electron is approximately 2.48 x 106 m/s.
(a) Find the force acting on the electron as it revolves in a circular orbit of radius 5.18x 10-11 m.
In a particluar x-ray tube, an electron approaches the target moving at 1.95 ? 108 m/s. compute the final speed of the electron
A spherical hydrogen-filled balloon is used to lift a load of 5705 N (in addition to the weight of the hydrogen). Find the minumum necessary radius for the balloon
A 87.0-kg man is riding an escalator in a shopping mall. What is the work done on the man by the gravitational force
A 40 g block of ice is cooled to -78°C and is then added to 550 g of water in an 80 g copper calorimeter at a temperature of 24°C. find the final temperature of the system consisting of the ice
A galvanometer has a full-scale current of 0.11 mA and a coil resistance of 57 Ω. This instrument is used with a shunt resistor to form an ammeter that will register full scale for a current of 74 mA. Determine the resistance of the shunt resistor.
A spaceship is approaching a space station at a speed of 2.0 105 m/s. The space station has a beacon that emits green light with a frequency of 5.93 1014 Hz. What is the change in this frequency
In the old west, a marshal riding on a train traveling 50 m/s seesa duel between two men standing on the Earth 50 m apart parallel tothe train. How much earlier did he fire
A ball swings in a vertical circle at the end of a rope1.40 m long. When the ball is36.3° past the lowest point on itsway up, its total acceleration is (-22.5 i + 20.2j) m/s2. Determine the magnitude of its radial acceleration.
An automobile club plans to race a 700kg car at the local racetrack. The car needs to be able to travel around several 155m radius curves at 87km/h.
Some object moves 220.0 m at an angle of 42° north of west. During this motion, a 68.0 N force acts on the same object, doing +5460.0 J of work on the object. what is this force's orientation
A uniform disk with a mass of 770 g and radius 17.0 cm is rotating on frictionless bearings with an rotational speed of 18.0 Hz, What is the new rotational speed of the disk
One of the Niagara turbines uses 172,000 cubic feet of water perminute under a head of 215 ft. What is the horsepower developed
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