A weight suspended from a spring is seen to bob up and down over a distance of 28 cm twice each second. What is its frequency?.

It is really hard for me right know

Does current flow through or across a resistor?

Which of these statements best explains how the hydrosphere interacts with the atmosphere to affect global climate? mountains block rain clouds and cause changes in global rainfall and evaporation. humans burn fossil fuels to produce greenhouse gases which cause global warming. humans cut down trees which affects the amount of oxygen in different parts of the globe. greenhouse gases, like carbon dioxide, dissolve in oceans and prevent global warming.