8. A road race is taking place along the track shown in the figure. All of the cars are moving at constant speeds. The car at point F is traveling along a straight section of the track, whereas all the other cars are moving along curved segments of the track. Which of the following accelerations is directed toward the OUTSIDE of the track? (A) The acceleration at A. (B) The acceleration at B(C) The acceleration at E. (D) The acceleration at F.
9. For general projectile motion, which of the following changes with time? Assume air resistance is negligible.
10. The compass of an airplane indicates that it is headed due north, and the airspeed indicator shows that the plane is moving through the air at 250 km/h. If there is a wind of 80 km/h from west to east, which of the following is closest to the velocity of the aircraft relative to the Earth?