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Homework Help: Which statement correctly describes speed?

  1. Aug 1, 2010 #1
    1. The problem statement, all variables and given/known data
    1. what are some uses of speed in daily life?

    2. Which of the following is not a rate?
    a. Amount of food consumed by each family member
    b. Daily cargo handled at PSA
    c. Petrol consumed per day
    d. Speed

    3. Which statement correctly describes speed?
    a. The distance covered per 1 liter of petrol
    b. The time taken to travel 1 m
    c. The distance travelled in 1 second
    d. The distance travelled at 1 m/s

    2. Relevant equations
    rate = an expression that shows how a quantity changes with time
    Average speed = rate at which an object covers certain distance

    3. The attempt at a solution
    1. we need a high speed to win a car race. that's the only usage of speed that I can think of. Are there others?

    2. a. not a rate because there is no information about time
    b. rate. can be stated as number of cargo per day
    c. rate
    d. rate
    Right or wrong?

    3. a. not speed
    b. not speed
    c. speed
    d. not speed
    Right or wrong?

    Thank you very much
  2. jcsd
  3. Aug 10, 2010 #2
    Re: rate

  4. Aug 10, 2010 #3
    Re: rate

    wow this is really elementary science.

    you're right for all.
  5. Aug 10, 2010 #4
    Re: rate

    yes I am in 9th grade :smile:

    BTW, I am still need help for number (1). Thank you very much
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