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A child of mass 60.0 kilogram is rescued from a hotel fire by leaping into a firefighters' net. The window from which he leapt was 8.0 meter above the net. The firefighters lower their arms as he lands in the net thus that he is brought to a complete stop in a time of 0.40 second.
a) Determine his change in momentum during the 0.40 second interval?
b) Determine the impulse on the net due to the child during the interval? [Hint: Do not ignore gravity.]
c) Find the average force on the net due to the child during the interval?
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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