The magneto air gap is a precision measurement that's taken between the
a. edge of the flywheel and the ignition coil armature.
b. two breaker point contacts.
c. spark plug terminal and the ignition coil.
d. center electrode and the grounding electrode of a spark plug

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.