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Question1
A 59-kg person on skis starts from rest down a hill sloped at 36° from horizontal. The coefficient of friction between skis and snow is 0.16. After the skier had been moving for 5.0 s, the friction of the snow suddenly increased and made the net force on the skier zero. What is new coefficient of friction?
Question2
A runner of mass m = 50 kg and running at 4 m/s runs as exposed and jumps on the rim of a playground merry-go-round which has a moment of inertia of 375 kg.m2 and a radius of 2 meters. Assume the merry-go-round is initially at rest, what is its final angular velocity to three decimal places?
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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