Where did the heaven elements that make up the bulk of earth originate:

a in a supernova
b in meteorites
c in the big bang
d in the earth itself
e in the sun

The gun from the crime scene shows tool marks where the serial numbers are ground off. there are also tool marks on the bullets left behind. what information can the tool marks on the bullets and gun provide about the crime? what type of evidence does this information provide, individual or class?

What is the moment of inertia i of this assembly about the axis through which it is pivoted? express the moment of inertia in terms of mr

Asimple electrochemical cell contains two electrodes? t or f