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What's a new law of gravitation to replace F = GMm/r^2 at distances larger than some r-not, so that flat rotation curves occur without the need for dark matter? Any help with this would be greatly appreciated!
A 85.1 kg astronaut is working on the engines of a spaceship that is drifting through space with a constant velocity. How long does it take the astronaut to reach the ship
A wagon is coasting at a speed vA along a straight and level road. When thirty-four percent of the wagon's mass is thrown off the wagon, parallel to the ground and in the forward direction, the wagon is brought to a halt. If the direction in which th..
A box of unknown mass is sliding with an initial speed vi = 5.90 m/s across a horizontal frictionless warehouse floor when it encounters a rough section of flooring d = 2.10 m long. The coefficient of kinetic friction between the rough section of ..
A conveyor belt is used to move sand from one place to another in a factory. The conveyor is tilted at an angle of 13.3° from the horizontal and the sand is moved without slipping at the rate of 6.51 m/s. The sand is collected in a big drum 2.89 m be..
a 4.6kg sphere made of metal whose density is 3800kg/m^3, is suspended by a cord. What fraction of the volume of the sphere is submerged
A woman and her dog are out for a morning run to the river, which is located 3.5 km away. The woman runs at 2.4 m/s in a straight line. What is the total distance run by the dog
The planet Venus requires 225 days to orbit the sun, which has a mass M = 1.99 x 1030 kg, in an almost circular trajectory. Calculate the radius of the orbit of Venus and the orbital speed of Venus as it circles the sun.
an electric transformer is in a cylinderical tank 60cm in diameter and 1 meter high, with a flat top and bottom. how many degrees will the tanks surface rise above room temperature
explain What is the magnitude of the electric field next to the sheet.
A coordinate system (in meters) is constructed on the surface of a pool table, and three objects are placed on the table as follows: a 8.0 kg object at the origin of the coordinate system, a 16.0 kg object at (0, 2.0), and a 18.0 kg object at (4.0, 0..
A 500 kg cart is at the top of a steep track. It rolls from rest down a 7 meter hill. How much potential energy does it have at the top of the hill
Suppose Fuzzy, a quantum-mechanical duck, lives in a world in which h = 2?J · s. Fuzzy has a mass of 2.25 kg, What is the minimum uncertainty in the duck's speed
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