The input work done on a pulley system is 450j. what is the efficiency of the pulley system if the output work is 375j

The passage that directs air to the lungs is called a. diaphragm. b. larynx. c. bronchi. d. pharynx.

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false

The field lines around one end of a bar magnet are shown below based on the diagram, what can you conclude about the pole of the magnet? a.is a south pole because the field hnes spread out from this end b.a north pole because the field lines spread out from this end c.a nouth pole because the field lines enter the magnet at this end d.is a north pole because the field lines enter the magnet at this end