A child's toy consists of plastic attached to a spring.

Ben is interested in using a source that provides original research, current and developing trends and experts within specific fields. which source should he use?

Carbon dioxide can be produced form what type of power generation?

Which of the following would be considered a nec code violation in regards to the installation of luminaires? a. an outdoor lighting fixture mounted to a tree b. a five-pound, 12-inch diameter light fixture supported by the screw shell of the lampholder c. florescent lay-in fixtures attached to the framing sections of a suspended ceiling with sheet-metal screws d. track lighting over a sink, 2 feet from a bathtub