What do you mean by longitudinal strain​

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.

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.

Which of the following is the largest disadvantage of about half of the electricity in the united states comes from burning