Which statement provides the best description of a computational model? -It is an exact representation of reality, but on a scale we can use more easily.
-It is an individual’s guess about how things will work out.
-It is a simplified version of reality used to make predictions.
-It is something that allows us to know exactly what will happen if we input enough accurate information.

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.

Two point charges are on the y axis. a 3.90-µc charge is located at y = 1.25 cm, and a -2.4-µc charge is located at y = −1.80 cm. (a) find the total electric potential at the origin. v (b) find the total electric potential at the point whose coordinates are (1.50 cm, 0). v

Which of the following is not a transverse wave? a) soundb) lightc) radiod) all of thesee) none of these