Earthquakes produce several types of shock waves. the most well-known are the p-waves (p for primary or pressure) and the s-waves (s for secondary or shear). in the earth's crust, the p-waves travel at around 6.5 km/s while the s-waves move at about 3.5 km/s. the actual speeds vary depending on the type of material they are going through. the time delay between the arrival of these two waves at a seismic recording center tells geologists how far away the earthquake occurred. if the time delay is 73 s, how far from the seismic station did the earthquake occur?

Clara is shopping in a grocery store with her friend. each has their own shopping cart in which they want to place their items. the shopping carts are identical. clara and her friend add the same type and number of items to each of their carts. in the baking aisle, however, clara adds 20 pounds of sugar to her own cart, and her friend adds only 10 pounds of sugar to her own cart. which of the following statements best explains what clara must do to accelerate at the same rate as her friend? a. she must add more sugar to her cart. b. she must apply more force to move her cart. c. she must add 20 pounds of salt instead of 20 pounds of sugar to her cart. d. she must apply less force to move her cart.