A cinder block is sitting on a platform 20 m high. It has a mass of 5 kg. The block has J of gravitational potential energy. ASAP WILL GET BRAINIEST

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?

What was bohr’s contribution to the planetary model

Why do lunar and solar eclipse not happen every month