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An asteroid has been discovered revolving around the sun on a circular orbit with radius 4.2 times of the Earth's orbit around the SUN ( about 149.6 million km ). Knowing that it takes the Earth 1 year to complete a revolution, how may years does it take for that asteroid?
Suppose a constant ratio of 13.60 counts per minute per gram of living matter. A sample of a petrified tree was found to give 1.8 counts per minute per gram. How old is the tree.
question1calculates the average velocity in following two cases.a you walk 73.2m at the speed of 1.22ms and then run
A block of mass m = 3.40 kg is pushed a distance d = 2.30 m along a frictionless, Determine the work done by the net force on the block.
A 76kg student consumes 2500 Cal each day and stays the same weight. One day, he eats 3500 Cal and, wanting to keep from gaining weight, decides to "work off" the excess by jumping up and down.
A sphere of mass 10.0 kg and radius 0.45 m is subject to an angular acceleration about its center of 2.00 rad/s2. What are the final respective rotational kinetic energies, assuming both the objects began at rest
A hungry 161-kg lion running northward at 75.5 km/hr attacks and holds onto a 35.9-kg Thomson\'s gazelle running eastward at 61.4 km/hr. Find the final speed of the lion-gazelle system
In a popular amusement park ride, the rotating cylinder of radius 3.0 m is set in rotation at an angular speed of 7.0 rad/s. The floor then drops away, leaving the riders suspended against the wall in a vertical position.
the half-life of a muon at rest is 1.52 us. One can store muons for a much longer time by accelerating them to a speed very close to that of light, How fast will the muons have to be moving
Two plastic spheres, each carrying charge uniformly distributed throughout its interior, are initially placed in contact and then released, Find the maximum speed achieved by the sphere of mass 50.0g
Two 22.3-cm-focal-length converging lenses are placed 16.5?cm apart. An object is placed 35.0?cmin front of one lens. obtain the total magnification
The magnetic field in a microwave traveling through vacuum has amplitude 4.00 X 10^-11T, Find the amplitude and frequency of the elctric field
A string under tension of 50.0 N is used to whirl a rock in a horizontal circle of radius 2.5 m at a speed of 20.4 m/s on a frictionless table. What is the breaking strength, in Newtons, of the string
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