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Homework Help: Speed/ Velocity help!

  1. Sep 4, 2010 #1
    1. Speed equals ___________ of change of distance.

    2. Which of the following units measure speed?
    i. year per metre
    ii. millimetre per day
    iii. metre per kilogram
    iv. litre per second
    v. metre per hour

    3. Choose the standard international unit for velocity.
    i. km/h
    ii. miles/h
    iii. m/minute
    iv. m/s

    4. Convert the units of car speed to m/s.
    i. 60km/h
    ii. 80km/h
    iii. 100km/h

    A. 19.5m/s
    B. 16.7m/s
    C. 27.8m/s
    D. 22.2m/s
    E. 1666.7m/s

    5. Match each non standard unit to the best listed use.

    i. Miles per hour Read Answer Items
    ii. Kilometres per second Read Answer Items
    iii. Centimetres per year Read Answer Items
    iv Metres per minute Read Answer Items

    A. The speed at which the shoreline is eroded.
    B. Measuring car speed.
    C. Measuring the speed of a catapillar.
    D. Describing the speed of light.

    6. Speed and velocity are the same for a mousetrap car.

    True
    False

    7. Choose the correct formula for converting a mousetrap car's speed (m/s) into km/hr

    a. X 1000m/km then / 3600s/h
    b. X 60s/min then / 1000m/km
    c. X 1km/1000m X 60 s/min x 60 min/h
    d. /60s/min then X 1000m/km

    8. How far would you travel in a car if you you drove at 80 km/h for 1.5 h?

    a. 53.3 km
    b. 120 km/h
    c. 120 km
    d. 125 km

    9. If you walked 10 km at an average speed of 4km/h how many hours did you walk for?

    a. 2.5 km
    b. 40 h
    c. 3 h
    d. 2.5 h

    10. If a dolphin can swim up to a constant speed of 36km/h for 40 minutes, what is the maximum distance it could swim?

    a. 24km
    b. 27km
    c. 21km
    d. 30km

    11. If a car travelling at 60km/h has to cover 12km how long will it take?

    a. 720 min
    b.12min
    c. 15min
    d. 1/4 h

    12. Calculate the speed of a car if it travels 120km in 2 h.

    a. 60km/h
    b. 60km
    c. 240km/h
    d. 140km

    13. What is the average speed of a marathon runner if she covers the 42km in 3 hours?

    a. 15m/s
    b. 20km/h
    c. 14km/h
    d. 126km/h
    14. How fast is a sprinter running if he covers 100 metres in 10 seconds?

    a. 100m/s
    b. 1000m/s
    c. 1m/s
    d. 10m/s

    15. Convert 11m/s from m/s to km/h.

    a. 188km/h
    b. 0.18km/h
    c. 30.5km/h
    d. 39.6km/h

    16. Describe the average velocity of a person doing laps around an oval.

    a. The person has a constant average velocity all the time after starting
    b. The person's average velocity increases as they move away from the starting position but reduced back toward zero everytime they head back toward the starting position
    c. The person's average velocity keeps increasing as they run further
    d. It is not possible to describe their average velocity


    Thanks so much.. and sorry for all the questions :uhh:
     
  2. jcsd
  3. Sep 4, 2010 #2
    1. Speed equals ___________ of change of distance.

    I think its ''Time'' ?

    2. Which of the following units measure speed? (These are the ones I think is correct)
    i. year per metre
    ii. millimetre per day
    v. metre per hour

    3. Choose the standard international unit for velocity.
    iv. m/s

    4. Convert the units of car speed to m/s.
    i. 60km/h D. 22.2m/s
    ii. 80km/h B. 16.7m/s
    iii. 100km/h E. 1666.7m/s

    5. Im not sure about this question :S

    6. Speed and velocity are the same for a mousetrap car.
    >> False

    7. Choose the correct formula for converting a mousetrap car's speed (m/s) into km/hr

    b. X 60s/min then / 1000m/km

    8. How far would you travel in a car if you you drove at 80 km/h for 1.5 h?

    a. 53.3 km
     
  4. Sep 4, 2010 #3
    9. If you walked 10 km at an average speed of 4km/h how many hours did you walk for?

    d. 2.5 h

    10. If a dolphin can swim up to a constant speed of 36km/h for 40 minutes, what is the maximum distance it could swim?

    c. 21km

    11. If a car travelling at 60km/h has to cover 12km how long will it take?

    d. 1/4 h

    12. Calculate the speed of a car if it travels 120km in 2 h.

    a. 60km/h

    13. What is the average speed of a marathon runner if she covers the 42km in 3 hours?

    c. 14km/h

    14. How fast is a sprinter running if he covers 100 metres in 10 seconds?

    a. 100m/s

    15. Convert 11m/s from m/s to km/h.

    b. 0.18km/h

    16. Describe the average velocity of a person doing laps around an oval.

    a. The person has a constant average velocity all the time after starting
     
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