White light is incident normally on a thin soap film having an index of refraction of 1.34. it reflects with an interference maximum at 684 nm and an interference minimum at 570 nm with no minima between those two values. the film has air on both sides of it. what is the thickness of the soap film?

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.

Select the three ways that the parallel-plate capacitor differs from a car battery.

What is the weight of a 8-kg substance in n, kn, kg·m/s2, kgf, lbm·ft/s2, and lbf?