Determine the stretch in oa spring required to hold the 21kg- crate in the equilibrium position shown.

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.

What is the single most important equation in all of physics?

If you put a helium-filled balloon in the refrigerator, what will happen?