Which happens to the magnetic field of a wire when you change the direction of the current in the wire? it becomes stronger. it becomes weaker. it changes direction too. it stays the same.

The pressure proportional to the area a- inversely b- directly c- increase d-decrease

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.

Which of the following list the divisions of the geologic time scale in order from longest to shortest