What is 420 hg into g?

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

What will a positive and a negative charge do if they are separated from each other?

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.