You hear the engine roaring on a race car at the starting line. predict the changes in sound as the race starts and approaches the camera a. the sound of the engine will get louder and pitch lower b. the sound of the engine will get louder and pitch higher c. the sound is determined by the car and it will not change in anyway d. the sound of an engine will get louder but the pitch will not change

The answer is B because if you seen a movie you would see it happen

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

the total distance traveled by the car is

30km + 49km = 79 km .