A student hears a police siren. What would change the frequency that the student hears? Check all that apply. *

1. if the student walked toward the police car
2. if the student walked away from the police car
3. if the police car moved toward the student
4. if the police car moved away from the student
5. if the intensity of the siren increased
6. if the intensity of the siren decreased

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.