Arock with a volume of 4.5cm3 has a mass of 15.0g. what is the density of the rock?

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.

The ozone hole appears in antarctica during

The energy released by a nuclear fusion reaction is produced when