In 1911, ernest rutherford and his assistants geiger and marsden conducted an experiment in which they scattered alpha particles (nuclei of helium atoms) from thin sheets of gold. an alpha particle, having charge +2e and mass 6.64 ✕ 10−27 kg, is a product of certain radioactive decays. the results of the experiment led rutherford to the idea that most of an atom's mass is in a very small nucleus, with electrons in orbit around it. assume an alpha particle, initially very far from a stationary gold nucleus, is fired with a velocity of 2.70 107 m/s directly toward the nucleus (charge +79e). what is the smallest distance between the alpha particle and the nucleus before the alpha particle reverses direction? assume the gold nucleus remains stationary.
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Physics, 21.06.2019 22:20
Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage
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Physics, 22.06.2019 00:00
What should the power status of a circuit be when measuring resistance with an ohmmeter?
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Physics, 22.06.2019 11:30
Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.1 m below the tank bottom which is a = 7.4 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute)
Answers: 3
Physics, 22.06.2019 12:30
Awheel of mass 48 kg is lifted to a height of 0.8 m. how much gravitational potential energy is added to the wheel? acceleration due to gravity is g = 9.8 m/s2. a. 30.4 j b. 3.1 j c. 297.9 j d. 11,321 j
Answers: 1
In 1911, ernest rutherford and his assistants geiger and marsden conducted an experiment in which th...
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