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3 December, 10:15

A crate is hung from a spring with a force constant of 525 nm. this stretches the spring 0.30 m from its equilibrium position. what is the mass of the crate? use 10 m/s2

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Answers (2)
  1. 3 December, 12:33
    0
    16 kg.

    Hooke's law is:

    F = kX

    where

    F = Force

    X = displacement of spring

    k = force constant for spring.

    So let's calculate F

    F = kX

    F = 525 N/m * 0.30m

    F = 157.5 N

    F = 157.5 kg*m/s^2

    Now that we know the force, we can calculate the mass by dividing by the gravitational acceleration which has been given to use as 10 m/s^2. So 157.5 kg*m/s^2 / 10 m/s^2 = 15.75 kg

    So the mass of the crate is 15.75 kg. Rounding to 2 significant figures gives 16 kg.
  2. 3 December, 13:55
    0
    Lets use the expression

    F = k*x

    Where k is the spring constant [N/m]

    And x the distance from the equilibrium position.

    This force is equal to the force due to the acceleration of gravity

    F = k*x = m*g

    F = 525[N/m] * 0.30 [m] = 157.5 [N]

    157.5 [N] = m * 10[m/s**2] ... > m = 15.75 kg
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