Sears Tower in Chicago is 443m tall. How long would it take a rock dropped from the top to reach the ground if it starts from rest?

Calculate the kinetic energy of earth due to its spinning about its axis. krot = j compare your answer with the kinetic energy of the orbital motion of earth's center of mass about the sun. assume earth to be a homogeneous sphere of mass 6.00 1024 kg and radius 6.40 106 m. the radius of earth's orbit is 1.50 1011 m.

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If element x has 99 protons how many electrons does it have