If the work required to stretch a spring 4 feet beyond its natural length is 18 foot-pounds, how much work is needed to stretch it 20 inches beyond its natural length? Your answer must include the correct units. (You may enter lbf or lb*ft for ft-lb.)

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Gas cloud 1 is likely to form a star. gas cloud 2 is not. based on this information, match the given conditions with each cloud

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?