The second law of thermodynamics leads us to conclude that A. it is theoretically possible to convert heat into work with 100% efficiency. B. disorder in the universe is increasing with the passage of time. C. the average temperature of the universe is increasing with the passage of time, D. the total energy of the universe is constant. E. the entropy of the universe remains constant.

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?

Identify the type of heat transfer occurring when chocolate melts in your hand

Only 3% of the water on earth is usable by humans. even though that 3% is through the water cycle, we still need to be careful not to waste water.