Which of the following is not an example of physical evidence? testimony of the neighbor next door a knife near the accident scene fingerprints on the window footprints in the grass near the victim

Sara goes on a slingshot ride in an amusement park. she is strapped into a spherical ball that has a radius 3*10^2 of centimeters. what is the volume of air in the spherical ball? use this formula: volume of a sphere=4/3pi,r^3 , where r is the sphere’s radius.