Suponga que se deja caer libremente y en forma simultánea una plancha de acero y una hoja de papel. ¿Se puede asegurar que uno de los cuerpos siempre llegará primero al suelo? Justifique su respuesta.

Arock collection comes from which part of earth?

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?