A boy lifted a 50 newton rock 1 meter. How much work was done? Select one:
a. 1 Nm
b. 5 Nm
c. 10 Nm
d. 50 Nm

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?

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat

How does the entropy of steam compare to the entropy of ice?