6. Imagine that you have a sample of a substance. You cannot physically separate that substance into components. You also cannot chemically separate that substance
into components. Which of the following are true about your sample? Choose all
that apply.
A. The sample is made up of one type of atom.
B. The sample is made up of multiple elements.
C. The sample is made up of a single element.
D. The sample is made up of several types of atoms.

In a system, when potential energy decreases, then entropy also decreases. true false

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?

What causes the formation of ocean currents?