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Electrons in an x-ray machine are accelerated from restthrough a potential difference of 50 000V. what is the kinetic energy of each of these electrons in eV?
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. What is the orbital period of the faster planet
The helium-neon lasers most commonly used in student physics laboratories have average power outputs of 0.250 mW, Find the peak electric field strength
soap bubble (n = 1.40) having a wall thickness of 130 nm is floating in air. What is the wavelength of the visible light that is most strongly reflected
1200 kg car at velocity 25m/s brakes and stop moving after 40m. What is the coefficient friction between the tires and road
An excited electron in Na atom emits radiation at a wavelength 589nm and returns to the ground state. If the mean time for the transition is 20ns, ineherent width in the emission line.
A sprinter explodes out of the starting block with an acceleration of +3.9 m/s2, What is her velocity at the end of the race
Find the mass of this objectAn object of unknown mass is attached to an ideal spring with force constant 130 and is found to vibrate with a frequency of 5.60 Hz. found to vibrate with a frequency of 5.60 Hz. Find the period. Find the angular veloci..
A -49nC charge is distributed uniformly along the x-axis from x= -1.2m to x= 4m. Consider a point at y= 1.9m on the y-axis, What is the total magnitude of the electric field at the point
Water flows at 0.950 m/s from a hot water heater, through a 450-kPa pressure regulator. What's the flow speed in this pipe
Richard is driving home to visit his parents. 140 mi of the trip are on the interstate highway where the speed limit is 65 mph. How many minutes does he save
A copper rod 87cm long is used to poke a fire. The hot end of the rod is maintained at 103%u2218C, What is the temperature of the rod 26cm from the cool end
In a simple of the hydrogen atom, the electron revolves in a circular orbit around the proton with a speed of 1.1 x 106 m/s. Determine the radius of the electron's orbit
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