What is a Lunar Eclipse in (exactly) 7 words?

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

Where should a carbon monoxide detector be mounted?