State the principle of moments.
Figure 1 shows a bicycle brake lever that has been pulled with a 50 N force to apply the brake.
Figure 1
Draw two arrows on Figure 1 to show the directions of the tension in the brake cable and the force applied by the cyclist on the brake lever.
Calculate the moment of the force applied by the cyclist about the pivot. State an appropriate unit.
Calculate the tension in the brake cable. Assume the weight of the lever is negligible.
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