The table lists several radioisotopes that have technological uses. which radioisotope would be used by both archaeologists and botanists (scientists who study plants)? uranium-238 carbon-14 iodine-131 technetium-99

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.