Which is a chemical reaction? select one: a. a peanut shell cracking open into two halves b. solid chocolate melting into liquid chocolate c. water vapor condensing into liquid water on a window d. hydrogen gas and oxygen gas synthesizing into liquid water

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

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.

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?