What processes were involved in the formation of the model? How is the model similar to the real sedimentary sample? How is the model different from the real sedimentary sample?

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.

Sound is a disturbance that travels through a medium as a

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.