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In 1910 Rutherford performed a classic experiment in which he directed a beam of alpha particles at a thin gold foil. He unexpectedly observed a few of the particles scattered almost directly backward. This result was not consistent with then current models of atomic structure and led Rutherford to propose the existence of a very dense concentration of positive charge at the center of an atom-the atomic nucleus. The alpha particle has a charge of +2e and the gold nucleus a charge of +79e. Suppose that an alpha particle is initially a great distance from the gold, has a kinetic energy of 4.22 MeV (4.22 106 eV), and is headed directly at a gold nucleus. How close will the particle come to the center of the nucleus? Treat the nucleus and the alpha particle as point charges.
Two objects with masses of 2.10 kg and 6.80 kg are connected by a light string that passes over a frictionless pulley. (a) Determine the tension in the string.
question a rocket fires two engines simultaneously. one produces a thrust of 725n directly forward while the other
Tube A, in a 20°C room, is observed to support standingwaves at frequencies of 48 Hz, 60 Hz and 72 Hz, but not at anyfrequencies in between (but possibly at higher and lower frequencies). Meanwhile tube B, which is the same length, supports standi..
The Z0 boson, discovered in 1985, is themediator of the weak nuclear force, and it typically decays veryquickly. What is the lifetime of this particle
An individual uses a pulley and rope to raise a 25 kg mass to a height of 2.0 m. If it takes 5.0 seconds to do this, how much power was supplied
a circular loop of conducting wire measuring 12cm in diameter is placed into a .60-t magnetic field. what is the
Block 1, mass m, slides from rest down the inside of a bowl shaped container, starting from a vertical height h. The surface of the container is frictionless. To what vertical height does the combined mass slide
q1. what mass in grams of steam at 100degc have to be mixed with 277 g of ice at its melting point in a thermally
A 45.0 g ball of copper has a net charge of 2.1 µC. What fraction of the copper's electrons have been removed
A 6.70mW helium neon laser emits a visible laser beam with a wavelength of 636nm . How many photons are emitted per second
For a double-slit experiment with slit spacing 0.2 and wavelength 600, at what angular position is the path difference equal to one-fourth the wavelength.
Three point charges have equal magnitudes, two being positive andone negative. These charges are fixed to the corners of anequilateral triangle, as the drawing shows.
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