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If the radius of the Earth is 6380km and its mass is 5.98X10^24 , determine the actual average density of the Earth.
A man is to pull a 50 .0 kg crate across a level terrain with a force of 50.0 N. What is the coefficient of kinetic friction, if the work done by friction is - 4.30 x 102 J
Vector a has a magnitude of 15 units and points die east. Vector b points due south. What is the magnitude of b if a-b has a magnitude of 25 units
A very long straight wire carries current 44 A. In the middle of the wire a right-angle bend is made. Determine the magnetic field at the center of the arc
A train is travelling up a 3.2 degree incline at a speed of 3.55 m/s as the last car breaks free and begins to coast. How long does it take for the last car to come to rest.
A nonconducting solid sphere of radius R has a volume charge density that is proportional to the distance from the center. That is, ? = Ar for r R, where A is a constant. (Use the following as necessary: 0, A, r, and R, as necessary.)
A total charge of Q is deposited on a solid metal sphere of radius R. This charge distributes itself uniformly over the surface, yielding an electrostatic field E~ perpendicular =(sigma / e0) n^ just outside the sphere and E~ = 0 everywhere insid..
Two packing crates of massesm1= 10.0kg and m2=7.00 are connected by a light string that passes over a frictionless pulley, Find the acceleration of the 7.00 kg crate
A 10.0g plastic ball is dropped from a height of 3.30m and is moving at 3.00m/s, How much mechanical energy was lost during the balls fall
what is the horizontal distance x to the base. find the average net force exerted on him in the barrel of the cannon.
A diving board oscillates with simple harmonic motion of frequency 3.36 cycles per second, What is the maximum amplitude with which the end of the board can vibrate in order that the pebble placed there not lose contact with the board during oscillat..
The black hole at the center of the Milky way galaxy is estimated to contain about 4 million solar masses. (msun= 2 x 1030 kg), What is the Schwarzchild radius of our galaxy's black hole
Two lightbulbs operate on the same potential difference. What is the ratio of the current in bulb A to the current in bulb B
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