The planet earth consists of land formations, large masses of water, gases in the atmosphere, and living organisms.

from a scientific perspective, which makes the planet earth a system?

a.
the planet earth contains both matter and energy.

b.
the planet earth consists of many components that rely and interact with one another.

c.
there are many different components on the planet earth.

d.
the earth is made of materials that scientists want to study.

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.

Your friend increases her force on the desk by 30n . she doesn't change the direction of her push . what happens to the net force on the desk .will the desk accelerate

Which system of units is used by only a small number of countries in the world, including the u.s.