A student connects a circuit with a cell, an ammeter, and a
buzzer and listens to the buzzer.
She adds another cell.

Describe and explain what
happens if she turns one of the
cells around
( this is a year 8 question)

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.

To a of 4 x hz is 1. 0. mm nm nm

Ais a machine that makes work easier when a single force is applied. a simple machine b compound machine c endangered machine d complex machine