A piano designer wants to change the pitch of a wire by changing one the followi

Question

A piano designer wants to change the pitch of a wire by changing one the following four properties of the wire: the material, thickness, length or tension, while keeping the remaining three fixed. In order to increase the frequency of the sound, the designer should (Choose the most correct answer). change from an aluminum wire to a steel wire (steel has higher density) use a thicker wire of the same material use a longer wire d. increase the tension A box is raised using a rope. If the acceleration of the box, is 6.8 m/s^2 (upward) and the tension in the rope is 34 N, what is the mass of the box (in kg)?

Explanation / Answer

1.d

2. T-mg = ma

so, T= m(a+g)=34

so, m( 9.8 +6.8)= 34

so m(16.6) =34

so m = 34/16.6=2.048 kg.

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