An earthquake 50km from a city produces p and s waves that travel outward at 5000 and 3000 m/s, respectively. once city residents feel the shaking of the p wave, how much time do they have before the s wave arrives?

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

This is the number of complete movements of a wave per second.