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A threory of nuclear astrophysics is that all the heavy elements like uranium are formed in supernova explosions of massive stars, which immediately release the elements into space. If we assume that at the time of the explosion there were equal amounts of 235U and 238U, how long ago were the elements that formed our Earth released, given that the present 235U/238U ratio is 0.007? (The half-lives of 235U and 238U are 0.70 x 10^9 yr and 4.47 x 10^9 yr, respectively)
A small droplet of oil with mass of 3.04×10-15 kg is held suspended in a region of uniform electric field directed upward with a magnitude of 5325 N/C
Two ice skaters, Daniel (mass 60.0kg ) and Rebecca (mass 45.0kg ), are practicing. Daniel stops to tie his shoelace and, while at rest, is struck by Rebecca, What is the magnitude of Daniel's velocity after the collision
An astronomical telescope has
The Fermi energy of copper at 300 K is 7.05 eV. What is the average energy of a conduction electron
In travelling to the Moon, astronauts aboard the Apollo spacecraft put themselves into a slow rotation to distribute the sun's energy evenly. At the start of their trip, they accelerated from no rotation to 1.0 revolution every minute through a 12-mi..
A small plastic sphere with a charge of -5.0 nC is near another small plastic sphere with a charge of -15 nC, what is the distance between the spheres
A crate of mass 10.5 kilogram is pulled up a rough incline with an initial speed of 1.50 m/s. Find how much work is done by the 100 Newton force
A helium-neon laser of the type often found in physics laboratories has a beam power of 4.00 mW at a wavelength of 633 nm. Calculate the force exerted on this sphere
A newly discovered planet has a mean radius of 7380 km. A vehicle on the planet\'s surface is moving in the same direction as the planet\'s rotation, what is the period of the planet\'s rotation
Which of the following lineages make up the living Amniota
A copper wire is 6.00 m long and has a cross-sectional area of 1.00 multiplied by 10-4 m2. what is the maximum torque that can act on it
A wheel of moment of inertia of 5.00 kg•m^2 starts from rest and accelerates under a fix torque of 3.00 N•m for 8.00 second. Find the wheel rotational kinetic energy at end of 8.00 second
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