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A person ofmass 75 kg stands at the center of a rotating merry-go-roundplatform of radius 2.8 m and moment of inertia 1300 kgm2. Theplatform rotates without friction with angular velocity 3.0 rad/s.The person walks radially to the edge of the platform.
(a) Calculate the angularvelocity when the person reaches the edge.
rad/s
(b) Calculate the rotational kinetic energy of the system ofplatform plus person before and after the person'swalk.
J(before)
J(after)
Two spectators at a soccer game in Montjuic Stadium see, and a moment later hear, the ball being kicked on the playing field. The time delay for the spectator is 0.23 s, and for spectator B it is 0.12 s.
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Four protons and four electrons are located inside a pyramid and are separate from each other, What is the net value of electric flux through the surface of the pyramid
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