A 2.4kg block sliding on a rough horizontal surface is attached to one end of a horizontal spring ( k=188/m) which has its other end fixed. The block passes through the equilibrium position with a speed of 2.76m/s and first comes to rest at a displacement of 0.23m from equilibrium. What is the coefficient of kinetic friction between the block and the horizontal surface?

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Avery long solenoid of inner radius 2.75 cm creates an oscillating magnetic field of the form = for this solenoid, =0.00425 t and =319 rad/s. (a)what is the maximum value of the induced electric field at a perpendicular distance 1.45 cm from the axis of the solenoid? (b) what is the maximum value of the inducted electric field at a point 5.85 cm perpendicular from the axis of the solenoid?

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