A worker uses a 200cm lever to move a 200kg barrel. If the fulcrum is placed 50cm from the barrel, find the mechanical advantage of the lever. Given g=10N/kg​

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.