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1 July, 20:11

Two physics professors challenge each other to a 100 m race across a football field. The loser will grade the winner's lab reports for a month. Dr. Nelson runs the race is 10.40s. Dr. Bay runs the first 25.0 m with an average speed of 10.0 m/s, he next 50.0 m with an average speed of 9.50 m/s, and the last 25.0 m with an average speed of 11.1 m/s. Who is the winner?

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  1. 1 July, 20:35
    0
    Answer: Dr. Nelson

    Explanation:

    The velocity of Dr. Nelson = Distance of the race / time taken to complete the race

    V = 100/10.40 = 9.615m/s

    The average velocity of Dr. Bay is

    10 + 9.50 + 11.1 / 3 = 10.2m/s

    Comparing the average speed of the two racers, Dr. Nelson finished the race with 9.615m/s and Dr. Bay finished with 10.2m/s. Therefore Dr. Nelson won the race
  2. 1 July, 20:36
    0
    If Dr. Nelson's simple average speed all the way is 10.40 m/s

    And Dr. Bay's average speed would be x=100 / (10.0/4+9.5/2+11.1/4) = 400/40.1=4000/401=9.9m/s

    then he would be first in line
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Home » Physics » Two physics professors challenge each other to a 100 m race across a football field. The loser will grade the winner's lab reports for a month. Dr. Nelson runs the race is 10.40s. Dr. Bay runs the first 25.0 m with an average speed of 10.
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