Acamera creates a real image of a tree 40 m away. the image is formed 3.0 cm behind the lens. find the magnification.

Which of the choices below is one of the primary gases found in the atmosphere? a. helium b. carbon dioxide c. nitrogen d. argon

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.

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?