Two 10-cm-diameter charged disks face each other, 25 cm apart. The left disk is charged to - 50 nC and the right disk is charged to + 50 nC . Part A What is the electric field E⃗ , both magnitude and direction, at the midpoint between the two disks?

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.