Physics 1.1 - The Realm Of Physics

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| By Marcbrunssen
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Marcbrunssen
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Quizzes Created: 3 | Total Attempts: 2,515
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  • 1/5 Questions

    Earth's mass is about kg. Please estimate the number of atoms in the entire Earth.

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This quiz will test your knowledge and understanding of Physics topic 1.1.

Physics 1.1 - The Realm Of Physics - Quiz

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  • 2. 

    Earth's radius is about 6378km. Please estimate the number of atoms in Earth.

    Correct Answer
    A.
    Explanation
    Earth's radius is about  m. Each atom is about m.

    It takes  =  atoms to be as long as Earth's radius. Since Earth is three-dimensional, it should contain = atoms.
    If you forgot to convert the unit from kilometers to meters, you will end up with the wrong answer B.

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  • 3. 

    Please estimate how many times on average a human heart beats in a human's life time, assuming that the average person lives for 75 years and that the heart beats between 60 and 80 times per minute.

    Correct Answer
    A.
    Explanation
    The number of heartbeats in a human's lifetime is  heartbeats/min  min/hr  hr/day days/year  years heartbeats.

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  • 4. 

    Please calculate the thickness of a piece of paper in millimeters, assuming the thinkness of a 500-page book to be 5 cm.

    Correct Answer
    A.
    Explanation
    The thickness of a piece of paper is  .
    Pay attention to the units. It is 0.0001 in meters. But answer E is wrong.

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  • 5. 

    What is the ratio of the age of the universe to the time it takes for the traffic light to change from red to green, assuming that the age of universe is 14 billion years and the waiting time for the light change is 1 minute?

    Correct Answer
    A.
    Explanation
    14 billion years years  days/year  hr/day  sec/min  seconds. 
    The ratio is 

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  • Apr 23, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 10, 2012
    Quiz Created by
    Marcbrunssen
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