Calculate the potential energy of a rock with a mass of 55 kg while sitting on a cliff that is 27 m high

Stage in which a typical star has completely stopped fusion

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

Mercury metal is poured into a graduated cylinder that holds exactly 22.5 ml the mercury used to fill the cylinder mass in 306.0 g from this information calculate the density of mercury