A1.0 kg brick falls off a ledge of height 44m and lands on the ground at 3.0 s later.
a. find the final velocity of the brick using equations of motion
b. find the final velocity of the brick using conversation of energy

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

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.

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j