At what minimum speed must a roller coaster be traveling when upside down at the top of a circle so that the passengers do not fall out? assume a radius of curvature of 6.9 m

What structural formula represents 4 electrons shared between two atoms?

During cooling, the kinetic energy of the molecules falls. why does this happen? a. the motion of the molecules increases. b. the motion of the molecules slows down. c. the van der waals forces between molecules decrease d. the forces of attraction between the molecules are overcome.

Two technicians are discussing a starter that clicks repeatedly when the key is turned to the crank position. technician a says the solenoid hold-in winding is open. technician b says the solenoid pull-in winding is open. who is correct?