Asolid metal sphere of radius a = 2.5 cm has a net charge qin = - 3 nc (1 nc = 10-9c). the sphere is surrounded by a concentric conducting spherical shell of inner radius b = 6 cm and outer radius c = 9 cm. the shell has a net charge qout = + 2 nc. what is v0, the electric potential at the center of the metal sphere, given the potential at infinity is zero? v0 =

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Which is the best predictor of the radioactive nature of an isotope? o the proton-to-electron ratio the neutron-to-proton ratio o the neutron-to-electron ratio the electron-to-proton ratio