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Math Help - A vehicle travels a semi circular path of 48 metres radius

  1. #1
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    Smile A vehicle travels a semi circular path of 48 metres radius

    Hi All.

    What do I need to know to solve this problem;

    A vehicle is travelling a semi circular path of 48 metres radius in a time of 7 seconds, I am asked to find the velocity, speed, distance and displacement travelled?

    any help appreciated
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  2. #2
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    You need to know 3 things:

    The formula for the circumference of a circle.

    The difference between distance and displacement.

    The difference between speed and velocity.

    Hint: Think scalar vs. vector.

    Does that get you started?
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  3. #3
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    Hi Knowledge, you said;

    You need to know 3 things:

    The formula for the circumference of a circle.

    The difference between distance and displacement.

    The difference between speed and velocity.

    Hint: Think scalar vs. vector.

    Does that get you started?

    I said. These I already know, what I don't know is how to include the time and work it out?

    Sorry?
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  4. #4
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    Well, if you know all of the above, then I don't see how you cannot understand where to include time and work out the solutions.

    For example, velocity is a vector (includes both magnitude and direction) calculated by dividing the change in position (displacement) by the change in time:

    v=\frac{\Delta x}{\Delta t}
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  5. #5
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    Quote Originally Posted by Knowledge View Post
    Well, if you know all of the above, then I don't see how you cannot understand where to include time and work out the solutions.

    For example, velocity is a vector (includes both magnitude and direction) calculated by dividing the change in position (displacement) by the change in time:

    v=\frac{\Delta x}{\Delta t}
    Hi Knowledge, thanks for that info, my misunderstanding when reading the text books is whether my vehicle travelling round a semi-circle should be in Rad/s because the vehicle is going circler motion, or just m/s. I didn't know how to include the time because none of the examples i read included time in circler motion.

    Although I know the difference between speed, velocity, distance and displacement, I miss the point where knowing these terms can work out the result of my question?

    So I have c = 2 x pie x radius in my example = 301.6 metres around the circumference, then 301.6/7 = 43.1 m/s which is not necessarily Rad/s?
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