A spring has a spring constant of 20 N/m. If the spring is pulled 0.50 meters to stretch the spring. What force is exerted on the spring? Recall that Hooke’s Law if F=kx. Assume a frictionless surface.

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.