An element of atomic number 88 decays radioactively to an element of atomic number 82. Which of the following emissions achieve this result? a. one alpha particle and one beta particle
b. three alpha particles
c. one alpha particle
d. six beta particles

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.