The pendulum of the Charpy impact machine has a mass of 50kg and a radius of gyration of 1.75 A k m = . If it is released from rest when 0 o  = , determine its angular velocity just before it strikes the specimen S located at 90o  = .

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

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.

Name two kinds of practical electric pumps.