The first scientist to be credited for postulating that earth circled the sun was

Acube has a volume of 2011 cubic inches. what is the angle measure between a side of a cube and its interior diagonal?

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

Estimate the schwarzschild radius (in kilometers) for a mini-black hole formed when a superadvanced civilization decides to punish you (unfairly) by squeezing you until you become so small that you disappear inside your own event horizon. (assume that the your weight is 50 kg)