How could you measure the potential energy from your machine?

Blank liquids and gases exert a buoyant force on objects placed in them

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

What would be the result of an alpha particle coming into a magnetic field? a) the alpha particle will stop moving. b) the alpha particle will reverse its direction. c) the alpha particle will be deflected in a curve path. d) the alpha particle will continue to travel in a straight line.