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Two billion years ago a uranium deposit in Oklo (Africa) spontaneously underwent nuclear fission. This was determined by depletion of Uranium-235 in uranium ore from the region. The atomic ratio of Uranium-235 to Uranium-238 in current uranium is 1:139. What was the ratio of these two isotopes when the natural reactor went critical. Show your work.
q1. light passes through a 230 linesmm grating and is observed on a 1.0m wide screen located 1.3m behind the grating.
What is the largest wavelength that will give constructive interference at an observation point 171 from one source and 295 from the other source.
an inductor with an inductance of 2.90h and a resistor with a resistance of 6.00 ohms are connected to the terminals of
barium has a work function of 2.48 ev. what is the maximum kinetic energy of electrons if the metal is illuminated by
A high-speed drill reaches 2000 rpm in 0.50 s. What is the drill's angular acceleration? Through how many revolutions does it turn during this first 0.50s.
How many moles of oxygen are in an inflated basketball? Pressure in the ball is 181kPa, the temp is 310K, and diameter of ball is 36 cm
Consider a Young's two-slit experiment in which the wavelength of light is 45% smaller than the distance between the slits. How many complete dark fringes would be seen on a distant screen
A 2.00 meter long horizontal plank whose mass is 3.00 kg is placed so that the very end (the right end) rests on a retaining wall. The left end is put on the tailgate of the truck. However the tailgate is tilted a bit, so it only contacts the boar..
Two identical, small insulating balls are suspended by separate 0.37-m threads that are attached to a common point on the ceiling. determine the tension in the threads
A spherical balloon is made from a material whose mass is 2.33 kg.The thickness of the material is negligible compared to the 1.77-mradius of the balloon. The balloon is filled with helium (He) at atemperature of 283 K and just floats in air, neit..
One of the harmonic frequencies of tube A with two open ends is 845 Hz. The next-highest harmonic frequency is 910Hz.
Calculate g for space shuttle territory. A 7.0×10-2-{rm kg} toy airplane is tied to the ceiling with a string. When the airplane's motor is started, it moves with the constant speed of 1.30 m/s in a horizontal circle of radius 0.47 m.
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