An astronaut travels to a far-away moon with a 1.5 m long pendulum. She finds it takes her pendulum 6.0837 seconds to complete one full oscillation.

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

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.

Where do magnetic lines of force enter earth?