To calculate work done on an object, a. multiply the force in the direction of motion by the distance the object moved b. multiply all forces applied to the object by the distance the object moved c. divide the force in the direction of motion by the distance the object moved d. divide the distance the object moved by the force in the direction of motion

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.

Which of the following is not am example of a polymer? protein nylon kevlar concreta

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.