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Math Help - weight and mass

  1. #1
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    weight and mass

    1.) In an emergency stop to avoid an accident, a shoulder strap seatbelt hold a 60 kg firmly in place if the car were initially traveling at 90 km/h and came to a stop 5.5 s along a straight level road, what was the average force applied to the passenger by the seatbelt?

    2.) A 75.0 kg person is standing on a scale in an elevator. What is the reading of the scale in N (Newtons) if the elevator is (a) at rest, (b) moving up at a constant of 2.00 m/s, and (c) accelerating up at 2.00 m/s?

    TIA!
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by John 5 View Post
    1.) In an emergency stop to avoid an accident, a shoulder strap seatbelt hold a 60 kg firmly in place if the car were initially traveling at 90 km/h and came to a stop 5.5 s along a straight level road, what was the average force applied to the passenger by the seatbelt?
    Average accelaertion is a = (90000/3600)/5.5 ~= 4.545 m/s^2.

    Force is ma, so is 60*4.545 ~= 272.7 newtons

    RonL
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  3. #3
    Grand Panjandrum
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    Quote Originally Posted by John 5 View Post

    2.) A 75.0 kg person is standing on a scale in an elevator. What is the reading of the scale in N (Newtons) if the elevator is (a) at rest, (b) moving up at a constant of 2.00 m/s, and (c) accelerating up at 2.00 m/s?

    TIA!
    a) mg

    b) mg

    c) m(g+2)

    RonL
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