If a race car complete a 3.2mi oval track in 73.8s what is its average speed answer in units of mi/h Did the car accelerate 1. Yes the speed chnaged 2. Yes the direction of the motion chnaged 3. No thr speed didnt change
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IE oo A race car travels a complete lap on a circular track of radius $500 \mathrm{~m}$ in $50 \mathrm{~s}$. (a) The average velocity of the race car is (1) zero, (2) $100 \mathrm{~m} / \mathrm{s},$ (3) $200 \mathrm{~m} / \mathrm{s},$ (4) none of the preceding. Why? (b) What is the average speed of the race car?
The table shows speedometer readings at 10-second intervals during a 1-minute period for a car racing at the Daytona International Speedway in Florida. Time (s) Velocity (mi/h) 0 182.9 10 168.0 20 105.6 30 98.8 40 124.5 50 175.1 60 175.6 (a) Estimate the distance (in mi) the race car traveled during this time period using the velocities at the beginning of the time intervals. (Round your answer to three decimal places.) (b) Give another estimate (in mi) using the velocities at the end of the time periods. (Round your answer to three decimal places.)
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(a) The acceleration of a NASCAR race car is zero. Does this necessarily mean that the velocity of the car is also zero? (b) If the speed of the car is constant as it goes around the track, is its average acceleration necessarily zero? Justify your answers. Problem (a) Suppose that the race car is moving to the right with a constant velocity of $+82 \mathrm{~m} / \mathrm{s}$. What is the average acceleration of the car? (b) Twelve seconds later, the car is halfway around the track and traveling in the opposite direction with the same speed. What is the average acceleration of the car? Verify that your answers agree with your answers to the Concept Questions.
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