In a well-known novel, a person travels around the world in 80 days. What is the approximate average velocity for the entire trip? (Note that Earth's circumference at the equator is 40,075km.)

The  asthenosphere  is now thought to play a critical role in the movement of plates across the face of earth's surface. according to plate tectonic theory, the lithosphere consists of a relatively small number of very large slabs of rocky material.

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Choice a is correct.kinetic energy equation:     ke = (1/2)(m)(v²)this tells us that ke is directly proportional to mass and the square of velocity. in other words, the more mass and more velocity an object has, the more kinetic energy.if an object is sitting at the top of a ramp, there is no velocity and therefore no kinetic energy.     choices b and d are wrong.a golf ball has more mass than a ping-pong ball, so a ping-pong ball would have less kinetic energy than a golf ball rolling off the end of a ramp.     choice c is wrong.choice a is correct.