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A sample is being analyzed 5800 years after undergoing an alpha decay process. As the technician is analyzing, he observes the sample contains only 8.5% of the radium nuclei it initially contained. What is the half-life of the radium nuclei?
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Magnetic resonance imaging needs a magnetic field strength of 1.5 T. The solenoid is 1.8 m long and 75 cm in diameter. It is tightly wound with a single layer of 1.70-mm-diameter superconducting wire.
When one person shouts at a football game, the sound intensity level at the center of the field is 68.4 dB. When all the people shout together, how many people are at the game
A beam of protons at an accelerator creates a current of 120 mu/A. how many protons strike the target in 30.0 s
Suppose I mis-measure the apparent ?ux from a galaxy by 10%, and that I’m using the Tully-Fisher relationship to derive the galaxy’s distance. Assuming that the Tully-Fisher relationship and my measurement of the rotation speed of the galaxy are ..
Sound exits a diffraction horn loudspeaker through a rectangularopening like a small doorway. A person is sitting at an angle off to the side of a diffraction hornthat has a width D of 0.0869 m.
Robert is driving his convertible at the 65-mph speed limit. The car's soft, elastic ragtop roof is in the "up," or closed position, and the car's windows are closed. What will an observer most probable see happening to Robert's ragtop roof as the ob..
A particle with charge q moves in a circular orbit around the origin with radius a in the xy-plane with constant angular velocity omega. At t = 0 the particle sits at the point (a, 0).
How much work is needed to turn an electric dipole 180 o in a uniform electric field of magnitude 41.6 N/C if p = 2.66 × 10-25 C·m and the initial angle is 31.1o.
A person stands at a point P relative to two plane mirrors oriented at 90°. How far away do the person's images appear from each other to the viewer? (Let d = 5.0 m.
A block with mass of .6 kg has an initial speed of 4 m/s and slides along a horizontal surface with a kinetic frictional force of 700 N. How far will the spring be compressed
Two particles, with identical positive charges and a separation of 2.70 10-2 m, are released from rest. Immediately after the release, particle 1 has an acceleration A1 whose magnitude is 4.90 103 m/s2,
An object 0.600cm tall is placed 16.5cm to the left of the vertex of a concave spherical mirror having a radius of curvature of 24.0cm. Determine the orientation of the image
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