What statement best describes how wind weathered this rock The rock slowly moved over time due to the force of the wind.
The shape of the rock changed when the pressure of wind increased.
The rock broke down when the wind blew particles of sand against it.
The rock broke down when the temperature in the air decreased.

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For a particular reaction, ? h = -144.6 kj and ? s = -301.2 j/k. calculate ? g for this reaction at 298 k.

Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?