A road race is taking place along the track shown in the figure All of the cars

# A road race is taking place along the track shown in

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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.
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9. For general projectile motion, which of the following changes with time? Assume air resistance is negligible.
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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?
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Name (print): TYPE: B(Last) (First) 411. Figure below shows the position x of a cyclist as a function of time t. (2 points) (a) What is average velocity of the cyclist over the time interval from 0s to 9 s. _______ (b) What is the instantaneous velocity at t=9 s? ______________
12. The Lockheed SR-71 Blackbird holds the official Air Speed Record for a manned airbreathing jet aircraft with a speed of 980 m/s. (2 points) What is it in mile/hour? __________________________ (Keep 4 significant figures)
Name (print): TYPE: B(Last) (First) 513. A brick is released at rest from the roof of a building and strikes the ground in 2s, encountering no appreciable air drag. (3 points) (a) How tall is the building? ___________________________ (b) How fast is the brick moving just before it reaches the ground? _________________