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1) A 19 N horizontal force F pushes a block weighing 6.0 N against a verticall wall. The coefficient of static friction between the wall the block is 0.68 and the coefficient of kinetic friction is 0.48. Assume that the block is not moving initially.
a) Determine if the block will move.
b) In unit vector notation, what is the force exerted on the block by the wall.
2) A 'conical pendulum' has a small object, the bob, moving at the end of a cord in a level, horizontal circle at constant speed. (The cord 'sweeps out' a cone as the bob rotates.) The mass of the bob is 0.035 kg, the cord is 0.90 m long and has negligible mass, and the bob makes a circular path of circumference 0.92 m.
a) Determine the tension in the string.
b) Determine the speed of the bob.
A sphere of radius R is uniformly charged to a total charge of Q. It is made to spin about an axis that passes through its center with an angular speed ω. Find the magnitude of the resulting magnetic field at the center of the sphere.
A resistor is in the shape of a cube, with each side of resistance R . Find the equivalent resistance between any two of its adjacent corners.
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