In a movie, the heroine saves the day by cutting a wire before the time runs out on a timer. how did she change the circuit? she changed a short circuit to an open circuit. she changed an open circuit to a closed circuit. she changed a closed circuit to an open circuit. she changed a closed circuit to a short circuit.

Which of these metals are magnetic?

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?

Examine the drawing of a molecule. each ring represents an atom of nitrogen (n). what’s the chemical formula of this substance?