1.¿Qué cae primero, una hoja de papel lisa o una que se ha arrugado hasta hacerla una bolita? ¿Por qué? 2.¿Hacia dónde se dirige siempre la aceleración de la gravedad?

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There are weak or strong attractive forces between atoms of liquids with a high viscosity

What was the first instrument to ever record an earthquake?

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.