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A spring has a force constant of 100 N/m and an unstretched length of .07 m. One end is attached to a post that is free to rotate in the center of a smooth table. The other end is attached to a 1 kg disc moving in uniform circular motion on the table, which stretches the spring by .03 m. Friction is negligible. What is the centripetal force on the disc?
The surface waters of tropical oceans are at a temperature of 28?C while water at a depth of 1200 m is at 3?C. What is the maximum efficiency possible of such a heat engine
A Hall probe uses the Hall effect to measure the size of magnetic fields - it does this by measuring the potential difference across the electric field created by the displacement of charge
Two runners of mass 70 kg and 60 kg,respectively, have a total linear momentum of 350 kg*m/s. The heavier runner is running at 2.0m/s. Examine the possible velocitis of the lighter runner.
describe free-body diagram for the mass. Calculate the tension in each part of the rope.
A professor's office door is 0.9 wide, 2.0 high, and 4 thick; has a mass of 25; and pivots on frictionless hinges. A "door closer" is attached to door and top of the door frame.
When the tire surface is rotating at the maximum speed of 12 m/s stone flies out of the tread. The magnitude FN of the normal force that each side of the tread channel exerts on the stone is 1.8 N. suppose that only static friction supplies centripet..
Three equal point charges, each with charge 1.30 mu C, are placed at the vertices of an equilateral triangle whose sides are of length 0.600 m. Evaluate the electric potential energy U of the system?
As a result of the friction between their surfaces, after a while, both disks spin at the similar angular speed. Determine the work done by the frictional torque.
Two cars with equal mass collide head on. One car is going 18 mph. That car is push backward about 38 feet. What is the speed of other vehicle.
Two children, Mary and Kate, are riding on a merry-go-round. Mary is at a greater distance from the axis of rotation than Kate. Which child has the larger angular speed? Tangential speed? Centripetal acceleration?
A rock of mass 33 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 242 N. What is the magnitude of the acceleration of rock.
An electron is brought to a point 0.1 m from the center of the sphere. What is the force acting on the electron (magnitude and direction) ? What is the electric field (magnitude and direction ) at the point where the electron is located
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