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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.
A parallel-plate capacitor is made from two aluminum-foil sheets, each 5.6 wide and 6.0long. evaluate the capacitance of this capacitor
a 0.25 harmonic oscillator has a total oscillation energy of 9.9 j. if the oscillation amplitude is 20.0 cm what is the
A 16 kg wood ball hangs from a 2 m-long wire. The maximum tension the wire can withstand without breaking is 435 N. A 1.2 kg projectile traveling horizontally hits and embeds itself in the wood ball. What is the largest speed the projectile can ha..
Two conductors made of the same material are connected across the same potential difference. Conductor A has twice the diameter and twice the length of conductor B. What is the ratio of the power delivered to A and to the power delivered to B?show yo..
Dario, a prep cook at an Italian restaurant, spins a salad spinner and observes that it rotates 20.0 times in 5.00 seconds and then stops spinning it. What is the angular acceleration of the salad spinner
On a day when the wind is blowing toward the south at 3 m/s, determine the resultant velocity (speed and direction) of the runner
Tarzan has foolishly gotten himself into another scrape with the animals and must be rescued once again by Jane. How high will Tarzan and Jane go on their first swing
A 2000w air conditioner and 700w refrigerator each operate on 120V rms. find current through air conditioner
Two light sources are used in a photoelectric experiment to determine the work function for a particular metal surface. What stopping potential would be observed when using light from a red lamp
A step-down transformer has 2000 turns on the primary and 300 turns on the secondary, what is the secondary voltage amplitude
Suppose you were to disconnnect the battery (without losing any of the charge on the plates) and then remove the dielectric medium. What would be the new voltage across the plates
Illustrate what is the average emf that is induced in this coil if it is in a region where B=2.0 T upward, and the coil's plane is perpendicular to B?
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